In enzymology, a 10-hydroxydihydrosanguinarine 10-O-methyltransferase is an enzyme that catalyzes the chemical reaction S-adenosyl-L-methionine + 10-hydroxydihydrosanguinarine ⇌ {\displaystyle \rightleftharpoons } S-adenosyl-L-homocysteine + dihydrochelirubineThus, the two substrates of this enzyme are S-adenosyl methionine and 10-hydroxydihydrosanguinarine, whereas its two products are S-adenosylhomocysteine and dihydrochelirubine. Wikipedia