铁冬青酸杂质，98%，来源于救必应

10-Hydroxy-9-hydroxymethyl-1,2,6a,6b,9,12a-hexamethyl-3,4,5,6,6a,6b,7,8,8a,9,10,11,12,12a,12b,13-hexadecahydro-2H-picene-4a-carboxylic acid, 98%, from Ovateleaf holly bark