The molecule is a O-butenoyl-L-carnitine in which the acyl group is specified as crotonyl. It is an O-butenoyl-L-carnitine and a (2E)-enoyl-L-carnitine. It derives from a crotonic acid.
(3R)-3-[(E)-but-2-enoyl]oxy-4-(trimethylazaniumyl)butanoate