Tinostamustine(EDO-S101) is a first-in-class alkylating deacetylase inhibitor with IC50 values of 9 nM, 9 nM, 25 nM and 107 nM for HDAC1, HDAC2, HDAC3 and HDAC8 (Class 1 HDACs) respectively and 6 nM, 72 nM for HDAC6 and HDAC10 (Class II HDACs).