This enzyme belongs to the family of transferases, specifically those transferring one-carbon group methyltransferases. The systematic name of this enzyme class is S-adenosyl-L-methionine:(RS)-norcoclaurine 6-O-methyltransferase. This enzyme participates in alkaloid biosynthesis i.
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Sato F, Tsujita T, Katagiri Y, Yoshida S, Yamada Y (1994). "Purification and characterization of S-adenosyl-L-methionine: norcoclaurine 6-O-methyltransferase from cultured Coptis japonica cells". Eur. J. Biochem. 225 (1): 125–31. doi:10.1111/j.1432-1033.1994.00125.x. PMID7925429.
Stadler R, Zenk MH (1990). "A revision of the generally accepted pathway for the biosynthesis of the benzyltetrahydroisoquinoline reticuline". Liebigs Ann. Chem.: 555–562.