2. Organic impurities (a) They should not contain 2-naphthylamine, benzidine, amino-4-diphenyl (or xenylamine) or their derivatives;
2. Impuretés organiques a) Elles ne doivent contenir ni betanaphtylamine, ni benzidine, ni amino-4-diphényle (ou xénylamine), ni leurs dérivés;