A heat-developable color light-sensitive material is described, comprising a support having thereon at least (1) a light-sensitive silver halide emulsion, (2) a dye providing substance which releases a dye having a different diffusibility from that of the dye providing substance in correspondence or countercorrespondence to the light-sensitive silver halide when the light-sensitive silver halide is reduced under the condition of high temperature and (3) an organic acid precursor containing a structural moiety bonded to carbon atoms that is represented by formula (I) ##STR1## The heat-developable color light-sensitive material can provide color images having a high S/N ratio and a high image density.
The present invention is directed to novel inhibitors of system X
c
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, also known as the cystine/glutamate antiporter. The present invention is further directed to methods of treating and detecting cancer that overexpresses system X
c
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which includes but is not limited to gliomas (including glioblastoma), triple negative breast cancer, and bladder cancer. The present invention is further directed to methods of treating seizures including epileptic seizures.