(2S)-3,4-Dihydro-7-hydroxy-2H-1-benzopyran-2α-carboxylic acid
(2S)-3,4-Dihydro-7-hydroxy-2H-1-benzopyran-2α-carboxylic acid ??
??
(2S)-3,4-Dihydro-7-hydroxy-2H-1-benzopyran-2α-carboxylic acid C??? ??, ??, ??
(2S)-3,4-Dihydro-7-hydroxy-2H-1-benzopyran-2α-carboxylic acid ?? ?? ? ???
???
?? ??
(2S)-3,4-Dihydro-7-hydroxy-2H-1-benzopyran-2α-carboxylic acid ?? ??
???( 0)?? ??