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The title compound (Mo 4XS 15 P 6O 12 C 24 H 30 ), α Mo 4XS 3( μ dtp) 3(dtp) 3 (X=0.6S+0.4O; dtp= -S 2P〔OEt〕 2), isolated as a prismatic black crystal, was prepared from ethanolic solution of Mo(CO) 6, MoCl 5 and P 2S 5. It crystallizes in triclinic system, space group P1 with a=14.031(4), b=13.372(2), c=16.270(8), α=92.15(2), β = 72.91(3), γ = 95.20(2)°, V = 2905.4(2) 3, Z = 2, D c = 1.82 g/cm 3, M r=1598.93, F(000)=1564.8, λ =0.71069 (Mo Kα ), μ =1.584 mm -1 . The final R=0.058, R w =0.057 for 5016 observed reflections with I≥3.0σ(I ). The structure analysis reveals that the title compound has a 〔Mo 4XS 3〕 core, belonging to the cubane type tetranuclear molybdenum clusters family, with one of its four μ 3 caps being statistically occupied by S and O. Three dtp ligands chelated three μ X capped Mo atoms as terminal ligands, while another three dtp bridged these three Mo atoms and the fourth one, forming an α type cluster compound.