synthesis and characterization of 2-methoxy-6-phenyl-5h-pyrrolo[3,4-b]pyrazine-5,7(6h)-dione and 7-hydroxy-3-methoxy-6-phenyl-6,7-dihydro-5h-pyrrolo[3,4-b]pyrazine-5-one and some derivatives. Int J of Pharm Chem [Internet]. 2017 Aug. 30 [cited 2026 Mar. 10];7(8):121-30. Available from: https://ssjournals.co.in/index.php/ijpc/article/view/4267