Keywords: Beckmann mechanism.png Beckmann mechanism english wikipedia 2008-01-27 V8rik chemical en english wikipedia V8rik Beckmann rearrangement Triazines Original upload log wikitable - - 2008-01-27 11 07 15 487 × 312 4089 bytes 人神之间 <nowiki> Beckmann mechanism english wikipedia 27 Jan 2008 V8rik en english wikipedia V8rik </nowiki> |