3,7,12,17-Corrintetrapropanoic acid, 2,13,18-tris(carboxymethyl)-4,5,6,7,8,11,12,22-octadehydro-4,5,6,9,10,11,21,22-octahydro-3,5,8,9,13,15,18,19-octamethyl-, (1R-(1alpha,2alpha,3beta,9beta,13alpha,17beta,18alpha,19beta))-