The isoscalar structure functions xF(3) and F-2 are measured as functions of a: averaged over all Q(2) permissible for the range of 6 to 28 GeV of incident neutrino (anti-neutrino) energy at the IHEP-JINR Neutrino Detector. The QCD analysis of xF(3) structure function provides Lambda(4)/MS = (411 +/- 200) MeV under the assumption of QCD validity in the region of low Q(2). The corresponding value of the strong interaction constant alpha(S)(M-Z) = 0.123(-0.013)(+0.010) agrees with the recent result of the CCFR collaboration and with the combined LEP/SLC result.