Abstract
A thermodynamic perturbation theory of Weeks-Chandler-Andersen (WCA) type for non-linear model molecules is presented. The interaction potential is the n-centre Lennard-Jones potential. The structure of the system is obtained via the Percus-Yevick equation. The anisotropic reference system is represented by hard fused sphere bodies (HFSB) using the Boublík-Nezbeda equation of state (EOS). In this paper the theory is applied to non-linear three-centre Lennard-Jones molecules and compared to experimental data of liquid propane and cyclopropane.

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