prov:value
| - 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 each segment (a), (b), and (c) in Q, that each segment (a) or (b) has a segment (c) attached to it, and that each segment (c) has a segment (a) or (b) atta
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