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Chemical structures of 4′-O-methylhonokiol (-4′-methoxy-5,3′-di-(2-propenyl)-biphenyl-2-ol), 27a (2-methoxy-5,3′-di-(2-propenyl)- biphenyl-4′-ol), 32 (5,5′-di-sec-butyl- biphenyl-2,2′-diol) and 34a (2-butyloxy-5,3′-di-(2-propenyl)- biphenyl-4′-ol).
