(4S)-4-Hydroxy-D-proline methyl ester (hydrochloride)
(4S)-4-Hydroxy-D-proline methyl ester hydrochloride is a non-cleavable ADC linker used in the synthesis of antibody-dr_ug conjugates (ADCs). (4S)-4-Hydroxy-D-proline methyl ester hydrochloride is also a alkyl chain-based PROTAC linker that can be used in the synthesis of PROTACs.