preferred_name: 1,2-di-(9Z,12Z,15Z-octadecatrienoyl)-sn-glycero-3-phospho-N-methylethanolamine + S-adenosyl-L-homocysteine + H(+) => 1,2-di-(9Z,12Z,15Z-octadecatrienoyl)-sn-glycero-3-phosphoethanolamine + S-adenosyl-L-methionine