15-Methoxyprostacyclin 15-Methoxyprostaglandin I2 79743-29-6 O-15-Methylprostaglandin I2 ether Pgi2 15-methyl ether Prosta-5,13-dien-1-oic acid, 6,9-epoxy-11-hydroxy-15-methoxy-, (5Z,9alpha,11alpha,13E,15S)- Prostaglandin I2 15-methyl ether