| http://www.w3.org/ns/prov#value | - 1C5alkyl ; R7 is C1C5alkyl ; is from 1 to 4; m is from 1 to 7; n is from 1 to 4; when n = 2, Ri, R5 or R6 is a bivalent alkyl group; or Ri and R2 together with the 2 nitrogen atoms linking them form a (CH2) m ring ; when n = 3, Rl, R5 or R6 is a trivalent alkyl group; when n = 4, R1, R5 or R6 is a tetravalent alkyl group; and Ri and R2 in formula (1) are not simultaneously hydrogen.
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