6-Hydroxy-2,3,4-trimethoxyacetophenone is an intermediate in synthesizing Eupatorin 5-Methyl Ether (E938850), Sinensetin, eupatorin, 3'-hydroxy-5,6,7,4'-tetramethoxyflavone and rosmarinic acid contents and antioxidative effect of Orthosiphon stamineus from Malaysia.