CAS No 51252-09-6 , (2R)-2-[(2R,5S,6R)-6-[(2S,3S,4S,6R)-6-[(3S,5S,7R,9S,10S,12R,15R)-3-[(2R,
5R,6S)-5-ethyl-5-hydroxy-6-methyloxan-2-yl]-15-hydroxy-3,10,
12-trimethyl-4,6,
8-trioxadispiro[4.1.57.35]pentadec-13-en-9-yl]-3-hydroxy-4-methyl-
5-oxooctan-2-yl]-5-methyloxan-2-yl]butanoic acid