(2Z,6R)-6-[(3alpha,9xi,12beta)-3-hydroxy-4,4,10,12,14-pentamethylgona-7,13(17)-dien-17-yl]-2-methylhept-2-enoic acid 2-heptenoic acid, 6-[(3alpha,9xi,12beta)-3-hydroxy-4,4,10,12,14-pentamethylgona-7,13(17)-dien-17-yl]-2-methyl-, (2Z,6R)- 3alpha-Hydroxy-18(13-