2-[(2-pyridin-1-ium-1-ylacetyl)amino]ethyl dodecanoate dodecanoic acid 2-[[1-oxo-2-(1-pyridin-1-iumyl)ethyl]amino]ethyl ester lauric acid 2-[(2-pyridin-1-ium-1-ylacetyl)amino]ethyl ester 2-(2-pyridin-1-ium-1-ylethanoylamino)ethyl dodecanoate