(2R,5R)-2,6,6-trimethyloxane-2,5-dicarboxylic acid

(2,4-dimethyl-phenyl)-glyoxylonitrile

4,6,6-trimethylbicyclo[3.1.1]hept-3-en-7-one

2,4-二甲基苯胺

2,4-二甲基溴苯