x
uploads/pyran.jpg

pyran n.【化學】吡喃,氧(雜)芑。

pyrargyrite

Pyran is not aromatic , but the phrylium ion is 吡喃不是芳香的,但??英嗡離子是。

Pyran is not aromatic, but the phrylium ion is . 吡喃不是芳香的,但英嗡離子是。