2',4'-dihydroxychalcone => (2S)-7-hydroxyflavanone
2',4'-dihydroxychalcone => (2s)-7-hydroxyflavanone
2',4'-dihydroxychalcone => (2S)-7-hydroxyflavanone
2',4'-dihydroxychalcone => (2s)-7-hydroxyflavanone