“…For 3D‐QSAR studies, a data set of compounds with activities spanning five log units was selected from literature (Auzzas et al., ; Chen et al., ; Dallavalle et al., ; Gupta et al., ; Inks, Josey, Jesinkey, & Chou, ; Itoh et al., ; Jones et al., ; Kalin, Butler, Akimova, Hancock, & Kozikowski, ; Kozikowski, Tapadar, Luchini, Kim, & Billadeau, ; Kozikowski et al., ; Olsen & Ghadiri, ; Ontoria et al., ; Scarpelli et al., ; Smil et al., ). The HDAC6 inhibitory activities of the compounds were transformed into the corresponding pIC 50 (−log IC 50 ) values (Verma & Thareja, ; Wang, Cheng, Huang, Zhao, & Pang, ), which were then depicted as dependent variables in the CoMFA and CoMSIA analyses. Then, all the 54 inhibitors were distributed into training set and test set and categorized according to their pIC 50 values (Figure ; Supporting Information Figure S1).…”