prov:value
| - or interrupted by -O-, -S-, or by -NR7-, and/or is unsubstituted or substituted by C,1-C 5 alkyl; R7 is C1??C5alkyl; I is from 1 to 4; m is from 1 to 7; n is from 1 to 4; when n = 2, R1, R 5 or R6 is a bivalent alkyl group; or R1, and R2 together with the 2 nitrogen atoms linking them form a -(CH2)m- ring; when n = 3, R1, R5 or R6 is a trivalent alkyl group; when n = 4, R1, R5 or R6 is a tetraval
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