phosphonocholine 1,2-diacyl-sn-glycero-3-phosphonocholine 309.098 309.253 C(C[N+](C)(C)C)CP(=O)([O-])OC[C@H](OC(*)=O)COC(=O)* C11H20NO7P CHEBI:137212 chebi_ontology diacylglycerol 2-trimethylaminoethylphosphonate ammonium betaine