(6S,8aS)-N-[(4-carbamimidoyl-2-methylphenyl)methyl]-4-oxo-2-(phenylmethylsulfonyl)-1,3,6,7,8,8a-hexahydropyrrolo[5,1-f]pyrazine-6-carboxamide
(6S,8aS)-N-[(4-carbamimidoyl-2-methyl-phenyl)methyl]-4-oxo-2-(phenylmethylsulfonyl)-1,3,6,7,8,8a-hexahydropyrrolo[5,1-f]pyrazine-6-carboxamide
(6S,8aS)-N-(4-amidino-2-methyl-benzyl)-2-(benzylsulfonyl)-4-keto-1,3,6,7,8,8a-hexahydropyrrolo[1,5-a]pyrazine-6-carboxamide