Patent ID: 7022492

Claim:
A compound of the formula: wherein: R 19 is lower alkyl or is taken together with R 20 to form a ring, which may be a five- or six-member ring, usually a five-member ring; R 20 is lower alkyl, or is taken together with R 19 to form a ring as discussed above, R 1 is H or lower alkyl, R 2 is (a) —(CH 2 ) a C(O)(CH 2 ) b SR 3 , wherein a is 0 to 5, b is 1 to 5 and R 3 is lower alkyl or (CH 2 ) c C(O)NR 4 R 5 wherein c is 1 to 5, R 4 is H or lower alkyl and R 5 is H, an immunogenic carrier or a label, or (b) (A) d (Q) n wherein Q is H or —(CH 2 ) e CH(R 8 )(CH 2 ) f OC(O)(CH 2 ) g R 9 being H only when d is 1 wherein A is —C(O)(CH 2 ) h C(O)NR 10 ((CH 2 ) j O(CH 2 ) k O) m (CH) 2 NR 11 —, d is 0 or 1, n is 0 or 1 wherein one of d or n is 1, h is 1 to 5, R 10 is H or lower alkyl, j is 1 to 5, k is 1 to 5, m is 1 to 3, R 11 is H or lower alkyl, e is 1 to 5, R 8 is OH or H, f is 1 to 5, g is 0 to 5, and R 9 is H, an immunogenic carrier or a label; W is H or JR 14 being H when R 2 is other than H or lower alkyl, wherein J is O or S, R 14 is H, lower alkyl, a protecting group, or —(CH 2 ) r C(O)NR 15 (CH 2 ) s (D) t R 16 , wherein r is 1 to 5, R 15 is H or lower alkyl, s is 1 to 5, D is S, O, or NH, t is 0 or 1 being 0 when R 16 is maleimidyl or succinimidyl, R 16 is H, maleimidyl, succinimidyl, or —(CH 2 ) q C(O)NR 17 R 18 , q is 1 to 5, R 17 is H or lower alkyl, R 18 is H, lower alkyl, an immunogenic carrier or label, and including the acid salts thereof.