1-Propanaminium, 3-carboxy-2-hydroxy-N,N,N-trimethyl-, (2R)-,(2E)-2-butenedioate (1:1) (salt)OTHER CA INDEX NAMES:2-Butenedioic acid (2E)-, ion(1-),(2R)-3-carboxy-2-hydroxy-N,N,N-trimethyl-1-propanaminium