2-Butenoic acid, 2-methyl-, 7-((2,3-dihydroxy-2-(1-methylethyl)-1-oxobutoxy)methyl)-2,3,5,7a-tetrahydro-1H-pyrrolizin-1-yl ester, (1R-(1alpha(Z),7(2S*,3S*),7abeta))- 74410-74-5 Symlandine