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[en] We study the reaction e+e-→e+e-ηc, ηc→KSK±π± and obtain ηc mass and width values 2982.2±0.4±1.6 MeV/c2 and 31.7±1.2±0.8 MeV, respectively. We find Γ(ηc→γγ)B(ηc→KKπ)=0.374±0.009±0.031 keV, and measure the γγ*→ηc transition form factor in the momentum transfer range from 2 to 50 GeV2. The analysis is based on 469 fb-1 of integrated luminosity collected at PEP-II with the BABAR detector at e+e- center-of-mass energies near 10.6 GeV.