| http://www.w3.org/ns/prov#value | - In another embodiment, the invention provides a cytotoxic drug-cleavable substrate compound having a structure according to Formula 2: X2 L1 mD (2) The symbol L1 represents a self-immolative spacer where m is an integer of 0, 1, 2, 3, 4, 5, or 6.
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