| http://www.w3.org/ns/prov#value | - Thus e.g. 4-nitrophenylisocyanate undergoes water addition and subsequent condensation upon storage, whereby dimers, trimers and other oligomers are formed which cannot be reacted with amines in the subsequent step (see Houbed-Weyl: Methoden der organischen Chemie, Georg Thieme Verlag, Stuttgart, 1952, Vol.
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