(4Z,9alpha,11alpha,13E,15R)-9,11,15-Trihydroxy-16,16-dimethylprosta-4,13-dien-1-oic acid 16,16-Ddpgf1alpha 16,16-Dimethyl-delta(4)-cis-pgf1alpha 16,16-Dimethyl-delta(4)-cis-prostaglandin F1alpha 16,16-Dimethyl-delta(4)-prostaglandin F1alpha 57931-23-4