4-heptenoic acid, 2,6-bis[[(1,1-dimethylethoxy)carbonyl]amino]-4-fluoro-7-hydroxy-, methyl ester, (4Z)- InChI=1/C18H31FN2O7/c1-17(2,3)27-15(24)20-12(10-22)8-11(19)9-13(14(23)26-7)21-16(25)28-18(4,5)6/h8,12-13,22H,9-10H2,1-7H3,(H,20,24)(H,21,25)/b11-8 methyl (4Z)-2,6-bis[(tert-butoxycarbonyl)amino]-4-fluoro-7-hydroxyhept-4-enoate