(Z)-4-[(2R,6S)-6-((E)-4-Oxo-pent-2-enyl)-5,6-dihydro-2H-pyran-2-yl]-but-2-enoic acid methyl ester

(Z)-4-[(2R,6S)-6-(2-Oxo-ethyl)-5,6-dihydro-2H-pyran-2-yl]-but-2-enoic acid methyl ester

(3Z,9E)-(1R,7S,11S,15R,17R)-11-(tert-Butyl-dimethyl-silanyloxy)-7-(tert-butyl-diphenyl-silanyloxymethyl)-15-methyl-6,21-dioxa-bicyclo[15.3.1]henicosa-3,9,19-triene-5,13-dione

(Z)-4-{(2R,6S)-6-[(2E,7E)-(R)-6-(tert-Butyl-dimethyl-silanyloxy)-11-(tert-butyl-diphenyl-silanyloxy)-10-hydroxy-4-oxo-undeca-2,7-dienyl]-5,6-dihydro-2H-pyran-2-yl}-but-2-enoic acid

(Z)-4-{(2R,6S)-6-[(2E,7E)-(S)-6-(tert-Butyl-dimethyl-silanyloxy)-11-(tert-butyl-diphenyl-silanyloxy)-10-hydroxy-4-oxo-undeca-2,7-dienyl]-5,6-dihydro-2H-pyran-2-yl}-but-2-enoic acid