Substances related to self-reactive substances (see 2.2.41.1.19).

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2.2.41.1.19:

"Substances that:

(a) have been provisionally accepted into Class 1 according to Test Series 1 and 2 but exempted from Class 1 by Test Series 6;
(b) are not self-reactive substances of Class 4.1; and
(c) are not substances of Classes 5.1 or 5.2;

are also assigned to Class 4.1. UN Nos. 2956, 3241, 3242 and 3251 are such entries."