| http://www.w3.org/ns/prov#value | - another, are alkyl and 0-20% of the radicals R1, R2, R3 and R4, independently of one another, are alkenyl, aryl or cyanoalkyl; and (c) X2???R???X2, where R is a divalent organic radical having up to 20 carbon atoms, and each X2, independently of the others, is ???NHCO???, ???CONH???, ???NHCONH???, ???COO???, ???OCO???, ???NHCOO??? or OCONH???; with the provisos that there must be at least one of e
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