上游原料
(1S,2S,3R,4S,7R,9S,10S,12R,15S)-4-(acetoxy)-1,9,12,15-tetrahydroxy-10,14,17,17-tetramethyl-11-oxo-6-oxatetracyclo[11.3.1.0(3,10).0(4,7)]heptadec-13-en-2-yl benzoate(1S,2S,3R,4S,7R,10S,15S)-4-(acetyloxy)-1,9,15-trihydroxy-10,14,17,17-tetramethyl-11,12-dioxo-6-oxatetracyclo[11.3.1.0~3,10~.0~4,7~]heptadec-13-en-2-yl benzoate(1S,2S,3R,9S)-3-[(2R,3S)-3-(acetyloxy)-2-(2-oxoethyl)oxetanyl]-1,5,9-trihydroxy-4,8,11,11-tetramethyl-6-oxobicyclo[5.3.1]undeca-4,7-dien-2-yl benzoate(1S,2S,3R,9S)-3-[(2R,3S)-3-(acetyloxy)-2-(2-hydroxyethyl)oxetanyl]-1,5,9-trihydroxy-4,8,11,11-tetramethyl-6-oxobicyclo[5.3.1]undeca-4,7-dien-2-yl benzoate(1S,2S,3R,9S)-3-((2R,3S)-3-(acetyloxy)-2-{2-[(triethylsilyl)oxy]ethyl}oxetanyl)-1,9-dihydroxy-4,8,11,11-tetramethyl-6-oxo-5-[(triethylsilyl)oxy]bicyclo[5.3.1]undeca-4,7-dien-2-yl benzoate(4S,5R)-3-(tert-butoxycarbonyl)-4-isobutyl-2-phenyl-1,3-oxazolidine-5-carboxylic acid
