15alpha,16(R),16-Methyl-16-methoxy-PGE1 15alpha,16(R),16-Methyl-16-methoxy-prostaglandin E1 83656-28-4 Prost-13-en-1-oic acid, 11,15-dihydroxy-16-methoxy-16-methyl-9-oxo-, (11alpha,13E,15R,16R)-