10-Ethyl-3-(5-methyl-1,3,4-oxadiazol-2-yl)-10H-phenothiazine by Li-Cheng Sun, Yu-Zhen Pan, You-Gui Wang, Jian-Hui Liu

“…In the title compound, C17H15N3OS, the phenothiazine ring system is slightly bent, with a dihedral angle of 13.68 (7)° between the benzene rings. …”
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2-(2-Hydroxypropan-2-yl)-6-(prop-2-ynyloxy)-1-benzofuran-3(2H)-one by Henok H. Kinfe, Yonas H. Belay, Zanele H. Phasha

“…In the title compound, C14H14O4, the prop-2-ynyloxy O—C—C[triple-bond]C plane [maximum deviation = 0.0116 (12) Å] forms a dihedral angle of 78.44 (9)° with the benzofuran-3(2H)-one ring system. In the crystal, molecules are linked by O—H...O hydrogen bonds, forming a tape along the a-axis direction. …”
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3-Anilinomethyl-5-chloro-1,3-benzoxazol-2(3H)-one by Orhan Büyükgüngör, Mehmet Akkurt, Zeynep Soyer, Abdullah Aydın

“…In the title compound, C14H11ClN2O2, the 2,3-dihydro-1,3-benzoxazole ring system is essentially planar [maximum deviation = 0.009 (2) Å] and makes a dihedral angle of 79.15 (7)° with the phenyl ring. …”
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2-Chloro-3-[(E)-(hydrazin-1-ylidene)methyl]-6-methoxyquinoline by Ali Belfaitah, Sofiane Bouacida, Abdelmalek Bouraiou, Nassima Benhamoud, Thierry Roisnel

“…In the title compound, C11H10ClN3O, the quinoline ring system is essentially planar, the r.m.s. deviation for the non-H atoms being 0.014 (2) Å with a maximum deviation from the mean plane of 0.0206 (14) Å for the C atom bonded to the –CH—N=NH2 group. …”
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1-(4-Methylbenzyl)-1H-benzimidazol-2(3H)-one by Lahcen El Ammari, Mohamed Saadi, El Mokhtar Essassi, Fouad Ouazzani Chahdi, Youssef Kandri Rodi, Dounia Belaziz

“…In the title compound, C15H14N2O, the fused five- and six-membered ring system is essentially planar, the maximum deviation from the mean plane being 0.009 (1) Å. …”
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Isopropyl 2-(4,6-dimethyl-3-methylsulfinyl-1-benzofuran-2-yl)acetate by Hong Dae Choi, Pil Ja Seo, Byeng Wha Son, Uk Lee

“….π interactions between a methylene H atom and the aromatic carbon ring of the benzofuran ring system, and by C—H...O hydrogen bonds. Adjacent stacked molecules exhibit a carbonyl–carbonyl interaction [3.295 (2) Å]. …”
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6-Hydroxy-2H-1,3-benzodioxole-5-carbaldehyde by Muhammad D. Bala, Deresh Ramjugernath, Neil Koorbanally, Mehbub I. K. Momin

“…The title compound, C8H6O4, crystallizes with two independent molecules in the asymmetric unit. The benzodioxole ring system is almost planar in each molecule, with maximum deviations of 0.008 (1) and 0.007 (1) Å. …”
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6-(4-Methylphenyl)-3-(3,4,5-trimethoxyphenyl)-1,2,4-triazolo[3,4-b][1,3,4]thiadiazole by Weiyi Zhou, Hai-Jun Du, Hai-Tang Du

“…In the molecule of the title compound, C19H18N4O3S, the central heterocylic ring system is oriented with respect to the trimethoxyphenyl and 4-methylphenyl rings at dihedral angles of 1.1 (5) and 15.1 (5)°, respectively. …”
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1-[4-(Diaminomethyleneaminosulfonyl)phenyliminiomethyl]-2-naphtholate N,N-dimethylformamide disolvate by Raafat Issa, Kamal El-Baradie, Keiko Isagai, Shigeyuki Masaoka, Ken Sakai, Hoda El-Ghamry

“…The dihedral angles of the guanidine group and the naphthyl ring system with respect to the central benzene ring are 76.04 (7) and 3.45 (9)°, respectively. …”
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Synthesis and Preliminary Antibacterial Study of New 2-Mercapto-1, 3- Benzothiazole DerivativesWith Expected Biological Activity by Samer Abbas Ali

“… Benzothiazoles are bicyclic ring system which have multiple applications. as antitumor , antiviral , antibacterial , anthelmintic and some of them showed glucose level.20 lowering effect. …”
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3-(Ferrocen-1-ylcarbonyl)-1-methyl-4-(4-methylphenyl)spiro[pyrrolidine-2,11′-indeno[1,2-b]quinoxaline] by B. Vijayakumar, D. Gavaskar, T. Srinivasan, R. Raghunathan, D. Velmurugan

“…The indeno–quinoxaline ring system [86.44 (5)°], the methylphenyl ring [86.06 (7)°] and the ferrocene rings [82.00 (7) and 83.95 (9)°] are almost perpendicular to the pyrrolidine ring. …”
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3-Benzyl-6-methyl-2-sulfanylidene-2,3-dihydroquinazolin-4(1H)-one by Hoong-Kun Fun, Madhukar Hemamalini, Mohamed Al-Omar, Hussein El-Subbagh, Rashad Al-Salahi

“…In the title compound, C16H14N2OS, the quinazoline ring system is essentially planar, with a maximum deviation of 0.029 (3) Å. …”
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The nature and fate of natural resins in the geosphere Part XI.† Ruthenium tetroxide oxidation of a mature Class Ib amber polymer‡ by Anderson Ken B

“…These data also suggest that the reaction which results in formation of the residual unsaturated structure in mature ambers also results in a second covalent connection between the A/B ring system and the polymer backbone, probably through C8 of the original labdanoid structure.…”
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2-(7-Hydroxy-2-naphthyloxy)-N-(6-methyl-2-pyridyl)acetamide by Shyamaprasad Goswami, Rinku Chakrabarty, Subrata Jana, Samuel Robinson Jebas, Hoong-Kun Fun

“…In the title compound, C18H16N2O3, the dihedral angle between the naphthalene ring system and the pyridyl ring is 18.1 (8)°. …”
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A cascade strategy enables a total synthesis of (-)-gephyrotoxin. by Chu, S, Wallace, S, Smith, M

“…A hydroxy-directed reduction of this intermediate plays a key role in establishing the required cis-decahydroquinoline ring system, enabling the total synthesis of (-)-gephyrotoxin in nine steps and 14% overall yield. …”

THE CRYSTAL-STRUCTURE OF 1,1'-(1,4,10,13-TETRAOXA-7,16-DIAZACYCLO-OCTADECANE-7,16-DIYLDICARBONYL)FERROCENE DIHYDRATE by Beer, P, Bush, C, Hamor, T

“…There are two molecules of water for each molecule of the title compound situated outside the cryptand ring system. © 1988.…”

4-Allyl-6-bromo-2-phenyl-4H-imidazo[4,5-b]pyridine monohydrate by Ouzidan, Y., Rodi, Y.K., Zouihri, H., Essassi, E.M., Ng, S.W.

“…In the molecule of the title compound, C(15)H(12)BrN(3)center dot H(2)O, the phenyl ring is coplanar with the imidazopyridine ring system [dihedral angle = 0.4 (1)degrees]. The water molecule is disordered over two positions with occupancies of 0.58 (1) and 0.42 (1), and it is linked to the main molecule via an O-H...N hydrogen bond.…”

3-Bromo-6-nitro-1-(prop-2-ynyl)-1H-indazole by El Brahmi, N., Benchidmi, M., Essassi, E.M., Ladeira, S., Ng, S.W.

“…In the title compound, C(10)H(6)BrN(3)O(2), the indazole fused-ring system is nearly planar (r.m.s. deviation = 0.008 angstrom); its nitro substituent is nearly coplanar with the fused ring [dihedral angle = 4.5 (2)degrees]. …”

Dichloridobis(4-methylbenzyl)(1,10-phenanthroline-kappa N-2,N `)tin(IV) by Keng, T.C., Lo, K.M., Ng, S.W.

“…The dihedral angles between the heterocycle ring system and the benzene rings of the 4-methylbenzyl groups are 21.20 (12) and 28.71 (11)degrees.…”

HSD3B1 is an oxysterol 3β-hydroxysteroid dehydrogenase in human placenta by Alison Dickson, Eylan Yutuc, Catherine A. Thornton, James E. Dunford, Udo Oppermann, Yuqin Wang, William J. Griffiths

“…Most biologically active oxysterols have a 3β-hydroxy-5-ene function in the ring system with an additional site of oxidation at C-7 or on the side-chain. …”
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