2-(N-FORMYLHEXAHYDROHIPPUROYL)-1,2,3,4-TETRAHYDROISOQUINOLIN-1-ONE; Cyclohexanecarboxamide, N-[2-(3,4-dihydro-1-oxo-2(1H)-isoquinolinyl)-2-oxoethyl]-N-formyl-; N-[2-(3,4-Dihydro-1-oxo-2(1H)-isoquinolinyl)-2-oxoethyl]-N-formyl-cyclohexanecarboxamide; Praziquantel EP Impurity C; Praziquantel Related Compound C; Praziquantel Impurity 3; Praziquantel impurity C; Praziquantel related compound C RS; Praziquantel related compound C USP