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(12R,13S,14S)-(3E,5E,7E,9E)-16-(tert-butyldiphenylsiloxy)-12-carbamoyl-4,10-dimethyl-2-[(E)-ethylidene]-12,13-epoxy-14-hydroxy-11-oxohexadeca-3,5,7,9-tetraenoic acid methyl ester
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(12R,13S,14S)-(3E,5E,7E,9E,12E)-16-(tert-butyldiphenylsiloxy)-12-cyano-2-[(E)-ethylidene]-4,10-dimethyl-11-oxo-14-triethylsiloxy-12,13-epoxyhexadeca-3,5,7,9-tetraenoic acid methyl ester