A compound of Formula (I) or a pharmaceutically acceptable sait thereof, where: Q can be 1,2,4-triazin-3-yl, pyridazin-3-yl, 6-methylpyridazin-3-yl, or 6-fluoropyridazin-3-yl； R<；sup>；1<；/sup>； can be hydrogen, methoxy, trifluoromethoxy, oxetan-3-yl, 3-fluoroazetidin- l-yl, 3-methoxyazetidin-l-yl, or 3,3- difluoroazetidin- l-yl； R<；sup>；2<；/sup>； can be hydrogen or fluoro； R<；sup>；3<；/sup>； can be hydrogen or methoxy； and R<；sup>；4<；/sup>； can be methoxy, ethoxy, or methoxymethyl； provided that when R<；sup>；1<；/sup>； is hydrogen, methoxy or trifluoromethoxy, then R<；sup>；3<；/sup>； is not hydrogen, and/or R<；sup>；4<；/sup>； is methoxymethyl. The compound of formula (I) can inhibit glutaminase, e.g., GLS l.
