1 ZZX (6s)-2-(3-chloro-4-fluorobenzyl)-8-ethyl-10-hydroxy-N,6-dimethyl-1,9-dioxo-1,2,6,7,8,9-hexahydropyrazino[1',2':1,5]pyrrolo[2,3-D]pyridazine-4-carboxamide 1.000 2 ZYO (6s)-2-(3-chloro-4-fluorobenzyl)-8-ethyl-10-hydroxy-6-methyl-4-(5-methyl-1,1-dioxido-1,2,5-thiadiazolidin-2-yl)-7,8-dihydropyrazino[1',2':1,5]pyrrolo[2,3-D]pyridazine-1,9(2h,6h)-dione 0.700