2H,6H,10H-Benzo[1,2-b:3,4-b':5,6-b'']tripyran-2-one,11,12-dihydro-12-hydroxy-6,6,10,11-tetramethyl-4-propyl-, [10R-(10a,11b,12b)]-; (+)-Calanolide B; Calanolide B
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