| prov:value
| - CH3, or an electron pair, and R3 is selected from H, CH3, C(???NH)NH2, and C(O)-L-NHC(???NH)NH2; (iii) at least one linkage is of type (b1), and each R is H, R4 is an electron pair, and R3 is selected from C(???NH)NH2 and C(O)-L-NHC(???NH)NH2; (iv) at least one linkage is of type (b1), and each R is H, R4 is an electron pair, and R3 is selected from C(???NH)NH2 and C(O)-L-NHC(???NH)NH2, and more
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