Acetic acid 8-methoxychroman-3-yl ester
Acetic acid 8-methoxychroman-3-yl ester ??
??
Acetic acid 8-methoxychroman-3-yl ester C??? ??, ??, ??
Acetic acid 8-methoxychroman-3-yl ester ?? ?? ? ???
???
?? ??
Acetic acid 8-methoxychroman-3-yl ester ?? ??
???( 0)?? ??