(5Z,11alpha,13E,15S)-N-Acetyl-11,15-dihydroxy-9-oxoprosta-5,13-dien-1-amide 52533-44-5 CP 27,987 CP 27987 N-Acetyl-PGE2-carboxamide N-Acetylprostaglandin E2 carboxamide Prosta-5,13-dien-1-amide, N-acetyl-11,15-dihydroxy-9-oxo-, (5Z,11alpha,13E,15S)-