epigallocatechin gallate molecule 3d, molecular structure, ball and stick model, structural chemical formula small molecule ester

epigallocatechin gallate ester catechin epigallocatechin3gallate molecule molecular structure chemical formula model c22h18o11 atom chemistry compound atomic composition health extract antioxidant skeletal anticancer cancer egcg acid flavanoid flavanol polyphenol line gallic icon flat bond carbon oxygen science drawing hydrogen illustration disease education supplement medical medicine drug ball stick structural small ester