3,7,12,17-Corrintetrapropanoic acid, 2,8,13,18-tetrakis(carboxymethyl)-7,8,11,12-tetradehydro-9,10,11,22-tetrahydro-3,9,13,18,19-pentamethyl-, (1R-(1alpha,2alpha,3beta,9beta,13alpha,17beta,18alpha,19beta))-