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Chemical structure of rhamnetin (2-(3,4-dihydroxyphenyl)-3,5-dihydroxy-7-methoxychromen-4-one) and its isoforms (isorhamnetin (3,5,7-trihydroxy-2-(4-hydroxy-3-methoxyphenyl)chromen-4-one), tamarixetin (3,5,7-trihydroxy-2-(3-hydroxy-4-methoxyphenyl)chromen-4-one), and quercetin (2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxychromen-4-one)). The image was drawn using KingDraw software (http://www.kingdraw.cn/, accessed on 21 August 2022).
