“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, vol. 7, no. 8, pp. 121–130, Aug. 2017, doi: 10.7439/ijpc.v7i8.4267.