(2R,4R)-4-Hydroxypyrrolidine-2-carboxylic acid hydrochloride
cis-4-Hydroxy-D-proline hydrochloride is a non-cleavable ADC linker used in the synthesis of antibody-dr_ug conjugates (ADCs). cis-4-Hydroxy-D-proline hydrochloride is also a alkyl chain-based PROTAC linker that can be used in the synthesis of PROTACs.