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Molybdenum gallide superconductor Mo4Ga20Sb with Tc = 6.6 K represents a family of novel intermetallic superconductors Mo4Ga20X (X = S, Se, Te and Sb) of the Mo4Ga21 structure type which attracts significant scientific interest due to unusual properties of their superconducting state and enhanced electron-phonon coupling [1]. In particular, the specific heat of Mo4Ga20Sb follows the BCS-derived α-model [2] with the enhanced value of α = Δ(0)/(kBTc) = 1.825 and ΔCe/(γNTc) = 1.53 [3].