2-((53S,53aS,54S,57R,58R,510S,511R,517S)-14,15,16,24,25,26,53,515,516-nonahydroxy-52,55,513,3,8-pentaoxo-510-((3,4,5-trihydroxybenzoyl)oxy)-52,53,53a,54,55,57,58,510,511,513-decahydro-4,7-dioxa-5(17,8)-7,11-methano[1,4,7]trioxacyclotridecino[11,10,9-de]chromena-1,2(1,2)-dibenzenacyclooctaphane-54-yl)acetic acid