| prov:value
| - The antibody-drug conjugate compound of claim 4 or 8 having the formula: wherein L is an antibody and R17 is C1-C10 alkylene-, ???C3-C8 carbocyclo-, ???O???(C1-C8 alkyl)-, -arylene-, ???C1-C10 alkylene-arylene-, -arylene-C1-C10 alkylene-, ???C1-C10 alkylene-(C3-C8 carbocyclo)-, ???(C3-C8 carbocyclo)-C1-C10 alkylene-, ???C3-C8 heterocyclo-, ???C1-C10 alkylene-(C3-C8 heterocyclo)-, ???(C3-C8 heteroc
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