(2R)-3-Carboxy-N,N,N-trimethyl-2-[[(2E)-2-methyl-1-oxo-2-buten-1-yl]oxy]-1-propanaminium Inner Salt Hydrochloride; [R-(E)]-3-Carboxy-N,N,N-trimethyl-2-[(2-methyl-1-oxo-2-butenyl)oxy]-1-propanaminium Inner Salt Hydrochloride; (2R)-[R-(E)]-3-Carboxy-N,N,N-trimethyl-2-[[(2E)-2-methyl-1-oxo-2-butenyl]oxy]-1-propanaminium Inner Salt