| http://www.w3.org/ns/prov#value | - In formula lb, X 1 preferably represents a bond or a group of formula R 3 I -(CH 2 ) n -N-(CO) y -(CH 2 ) n - (where n is an integer of 0 to 4 (preferably 0 or 1 in the (CH 2 ) n moiety bonded to the tricyclic moiety and preferably 1,2 or 3 in the other (CH 2 ) n moiety) ; y is 0 or 1; and R 3 is hydrogen or C,_ 4 alkyl, preferably methyl) , -CO-NR 3 -(CH 2 ) n -NR 3 -CO-(CH 2 ) n - or NR 5 it -CO
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