label: trans-aconitate + S-adenosyl-L-methionine <=> (E)-2-(methoxycarbonylmethyl)but-2-enedioate + S-adenosyl-L-homocysteine
label_lc: trans-aconitate + s-adenosyl-l-methionine <=> (e)-2-(methoxycarbonylmethyl)but-2-enedioate + s-adenosyl-l-homocysteine