15-Keto-9,11-peroxidoprosta-5,13-dienoic acid 15-Keto-pgg(2) 15-Ketoprostaglandin G2 70711-59-0 Prosta-5,13-dien-1-oic acid, 9,11-epidioxy-15-oxo-, (5Z,9alpha,11alpha,13E)-