prov:value
| - nteger of 0 to 50, Y denotes (NR6 Cm H2m)e (NHCp H2p)f, in which m is an integer of 2 to 4, p is an integer of 2 to 4, and e+f is an integer of 0 to 50, R5 denotes (CH2)g --X3, in which g is an integer of 1 to 4, R6 denotes (CH2)h --X4, in which h is an integer of 1 to 4, and X1, X2, X3 and X4 independently denote groups selected from the group consisting of a carboxyl group, a salt of the carboxy
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