(2S)-7-Hydroxy-2-(4-hydroxyphenyl)-2,3-dihydro-4H-1-benzopyran-4-one 16006-91-0 17002-53-8 2885-30-5 4',7-Dihydroxyflavanone 4H-1-Benzopyran-4-one, 2,3-dihydro-7-hydroxy-2-(4-hydroxyphenyl)-, (S)- 578-86-9 Liquiritigenin