A compound of Formula (I): or a pharmaceutically acceptable salt thereof, is described. Q can be pyridazin-3-yl, 6-fluoropyridazin-3-yl; R1 can be H; R2 and R3 can each independently be C1-C6 alkyl, or R2 and R3 taken together are -(CH2)3-; or R1 and R2 taken together can be -(CH2)2- and R3 can be -CH3; R4 halo, -CH3, -OCH3, -OCHF2, -OCF3, or -CN; and n can be 0, 1, or 2. The compound of formula (I) can inhibit glutaminase, e.g., GLS1.描述了一種具有式(I)之化合物:或其藥學上可接受的鹽。Q可以是嗒-3-基、6-氟嗒-3-基;R1可以是H;R2和R3各自獨立地可以是C1-C6烷基,或R2和R3合起來是-(CH2)3-;或R1和R2合起來可以是-(CH2)2-並且R3可以是-CH3;R4係鹵素、-CH3、-OCH3、-OCHF2、-OCF3、或-CN;並且n可以是0、1、或2。該具有式(I)之化合物可以抑制穀胺醯胺酶,例如GLS1。