A compound of Formula (I): or a pharmaceutically acceptable salt thereof, where: Q can be 1,2,4-triazin-3-yl, pyridazin-3-yl, 6-methylpyridazin-3-yl, or 6-fluoropyridazin-3-yl; R1 can be hydrogen, methoxy, trifluoromethoxy, oxetan-3-yl, 3-fluoroazetidin-l-yl, 3-methoxyazetidin-1-yl, or 3,3-difluoroazetidin-1-yl; R2 can be hydrogen or fluoro; R3 can be hydrogen or methoxy; and R4 can be methoxy, ethoxy, or methoxymethyl; provided that when R1 is hydrogen, methoxy or trifluoromethoxy, then R3 is not hydrogen, and/or R4 is methoxymethyl. The compound of formula (I) can inhibit glutaminase, e.g., GLS1.一種具有式(I)之化合物:或其藥學上可接受的鹽,其中:Q可以是1,2,4-三-3-基、嗒-3-基、6-甲基嗒-3-基、或6-氟嗒-3-基;R1可以是氫、甲氧基、三氟甲氧基、氧雜環丁烷-3-基、3-氟氮雜環丁烷-1-基、3-甲氧基氮雜環丁烷-1-基、或3,3-二氟氮雜環丁烷-1-基;R2可以是氫或氟;R3可以是氫或甲氧基;並且R4可以是甲氧基、乙氧基、或甲氧基甲基;其條件係當R1係氫、甲氧基或三氟甲氧基時,則R3不是氫,和/或R4係甲氧基甲基。該具有式(I)之化合物可以抑制穀胺醯胺酶,例如GLS1。