PDE I dimer methyl ester

(S)-6-tert-butyl 1-methyl 8-(acetoxymethyl)-4-(benzyloxy)-7,8-dihydropyrrolo[3,2-e]indole-1,6(3H)-dicarboxylate

(S)-3-Acetoxymethyl-6-benzyloxy-5-((E)-2-methoxycarbonyl-vinylamino)-2,3-dihydro-indole-1-carboxylic acid tert-butyl ester