2-butenoic acid, 2-methyl-, (1R)-2,3,5,7a-tetrahydro-7-(hydroxymethyl)-1H-pyrrolizin-1-yl ester, (2Z)- 7-(hydroxymethyl)-2,3,5,7a-tetrahydro-1H-pyrrolizin-1-yl (2Z)-2-methylbut-2-enoate InChI=1/C13H19NO3/c1-3-9(2)13(16)17-11-5-7-14-6-4-10(8-15)12(11)14/h3-4,11-12,15H,5-8H2,1-2H3/b9-3-/t11-,12?/m1/s