480-83-1 Butanoic acid, 2,3-dihydroxy-2-(1-methylethyl)-, (2,3,5,7a-tetrahydro-1-hydroxy-1H-pyrrolizin-7-yl)methyl ester, [1S-(1.alpha.,7(2R,3S),7a.alpha.)]- Butanoic acid, 2,3-dihydroxy-2-(1-methylethyl)-, (2,3,5,7a-tetrahydro-1-hydroxy-1H-pyrrolizin-7-yl)methyl ester, [1S-[1.alpha.,7(2R*,3R*),7a.alpha.]]- ECHINATINE NSC89937