Synonyms: 13ab-Berbine, 2,3,9,10-tetramethoxy-(8CI); 6H-Dibenzo[a,g]quinolizine, 5,8,13,13a-tetrahydro-2,3,9,10-tetramethoxy-,(R)-; (+)-(R)-Tetrahydropalmatine; (+)-2,3,9,10-Tetramethoxyberbine;(+)-Corydalis B; (+)-Tetrahydropalmatine; (R)-(+)-Tetrahydropalmatine;(R)-Tetrahydropalmatine; Corydalis B; Corydalis alkaloid B; d-Tetrahydropalmatine