Patent ID: 11958908
Assignee: CRISPR THERAPEUTICS AG
Field: Pharmaceuticals (Chemistry)
Classification: CPC C  A  Y | IPC A  C

Claim 17:
18. The method of claim 16, wherein Am-L-Z is represented by formula (IB),, wherein R1 is H, OH, ORA, or ORC;
R2 is H, OH, ORB, or ORC;
RA and RB, when present, together with the oxygen atoms to which they are bound, combine to form an optionally substituted 5-membered heterocycloalkyl group;
R3 is H, RC, or RD;
R4, R5, R6, and R7 are each independently H, OH, ORC, ORD, RC, or RD;
R8 is OH, NH2, ORC, ORD, NHRC, or NRCRD;
R9 is H, OH, ORC, or ORD;
X is —S—, —S(O)—, or —SO2—;
RC is -L-Z;
RD is optionally substituted C1-C6 alkyl, optionally substituted C1-C6 heteroalkyl, optionally substituted C2-C6 alkenyl, optionally substituted C2-C6 heteroalkenyl, optionally substituted C2-C6 alkynyl, optionally substituted C2-C6 heteroalkynyl, optionally substituted cycloalkyl, optionally substituted heterocycloalkyl, optionally substituted aryl, or optionally substituted heteroaryl;
L is optionally substituted C1-C6 alkylene, optionally substituted C1-C6 heteroalkylene, optionally substituted C2-C6 alkenylene, optionally substituted C2-C6 heteroalkenylene, optionally substituted C2-C6 alkynylene, optionally substituted C2-C6 heteroalkynylene, optionally substituted cycloalkylene, optionally substituted heterocycloalkylene, optionally substituted arylene, optionally substituted heteroarylene, a dipeptide, —(C═O)—, a peptide, or a combination thereof; and
Z is a chemical moiety formed from a coupling reaction between a reactive substituent present on L and a reactive substituent present within the antibody or antigen-binding fragment thereof,
wherein Am comprises exactly one RC substituent.