sodium (2E)-4-oxo-4-({(3beta,5xi,9xi,18alpha)-29-oxo-29-[(2-{[(2E,6E,10E)-3,7,11,15-tetramethylhexadeca-2,6,10,14-tetraen-1-yl]sulfanyl}ethyl)amino]olean-12-en-3-yl}oxy)but-2-enoate