7-droxymetl-10,11-MDCPT-d5 is deuterium labeled 7-droxymetl-10,11-MDCPT, which is a is a payload that can be used for ADC synthesis.
References:
[1]. Cai JQ, Human anti-human HER3 antibodies and ADCs or drug conjugates for therapy, prevention and diagnosis of cancer or infection. 2023. WO2023143263 [2]. Wadkins RM, et al. drophilic camptothecin analogs that form extremely stable cleavable complexes with DNA and topoisomerase I. Cancer Res. 2004 Sep 15;64(18):6679-83.