2',4,4',6'-tetrahydroxychalcone <=> (2S)-naringenin
2',4,4',6'-tetrahydroxychalcone <=> (2s)-naringenin
2',4,4',6'-tetrahydroxychalcone <=> (2S)-naringenin
2',4,4',6'-tetrahydroxychalcone <=> (2s)-naringenin