label: a 1,2-diacyl-sn-glycero-3-phosphocholine + S-adenosyl-L-homocysteine + H(+) => a 1,2-diacyl-sn-glycero-3-phospho-N,N-dimethylethanolamine + S-adenosyl-L-methionine
label_lc: a 1,2-diacyl-sn-glycero-3-phosphocholine + s-adenosyl-l-homocysteine + h(+) => a 1,2-diacyl-sn-glycero-3-phospho-n,n-dimethylethanolamine + s-adenosyl-l-methionine