by spectrophotometric assay after incubation with an oxidizing mixture of cu ( ii ) ammine complex and ammonium persulfate , i could accurately and reproducibly determine o-quinoidal products of several potential synthetic cross-reactors and native poison ivy allergen , and could distinguish these from catecholamines , resorcinol , p-hydroquinone , and a closely related phenol .
C0035197
resorcinol
C0031428
phenol