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4,9-dihydro-7-methoxy-1-methyl-3H-pyrido[3,4-b]indole 9CI
is presently the preferred designation

Some of the other synonyms we have encountered in print

3,4-dihydro-7-methoxy-1-methyl-β-carboline

1-methyl-7-methoxy-3,4-dihydro-β-carboline

1-methyl-7-methoxy-3,4-dihydro-beta-carboline

3,4-dihydroharmine

O-methylharmalol

7-methoxy-harmalan

armalina

diidroarmina

harmadine

harmalin

harmalina

Гармалин

harmalol methyl ester

harmidine (Penick)

harmidin

Note: Several word above are simply different renderings of the same word. These are included to help readers using keyword searches