1 5E8 Ethyl (2z,4s)-4-{[(2s)-2-methyl-3-phenylpropanoyl]amino}-5-[(3s)-2-oxopyrrolidin-3-yl]pent-2-enoate 1.000 2 5GH Ethyl (4s)-5-[(3s)-2-oxopyrrolidin-3-yl]-4-[(3-phenylpropanoyl)amino]pent-2-enoate 0.963 3 5F2 Ethyl (2z,4s)-4-[(N-acetyl-L-phenylalanyl)amino]-5-[(3s)-2-oxopyrrolidin-3-yl]pent-2-enoate 0.839 4 5E9 Ethyl (2z,4s)-4-{[(2r,5s)-5-amino-2-(4-fluorobenzyl)-6-methyl-4-oxoheptanoyl]amino}-5-[(3s)-2-oxopyrrolidin-3-yl]pent-2-enoate 0.771 5 5EC Ethyl (2z,4s)-4-{[N-(3-methylbutanoyl)-L-phenylalanyl]amino}-5-[(3s)-2-oxopyrrolidin-3-yl]pent-2-enoate 0.765 6 5EB Ethyl (2z,4s)-4-{[N-(3-cyclopropylpropanoyl)-L-phenylalanyl]amino}-5-[(3s)-2-oxopyrrolidin-3-yl]pent-2-enoate 0.743 7 G81 Ethyl (4r)-4-{[N-(tert-butoxycarbonyl)-L-phenylalanyl]amino}-5-[(3s)-2-oxopyrrolidin-3-yl]pentanoate 0.743