One-pot synthesis of 2-substituted chromeno[3,4-d]imidazol-4(3H)-ones from 4-amino-3-nitrocoumarin and acids - Thomas D. Balalas; Michael G. Kallitsakis; Ioannis Fotopoulos; Dimitra J. Hadjipavlou-Litina; Konstantinos E. Litinas (ARKIVOC, 2019)