Extraction of gallic acid from chromolaena sp. using ultrasound-assisted extraction nork Afnan Azzahra, Ahmad Kamal, Suhaimi, Mohamad, Mardawani, Mohamad, Rizki, Wannahari, Ahmad Ziad, Sulaiman, Azilah, Ajit, Lim, Jun-Wei, Nurul Akmar, Che Zaudin

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