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We apply systematic structural coarse-graining based on optimizing a potential against the structure obtained in atomistic simulations to the small organic glass former ortho-terphenyl (OTP). Atomistic radial distributions at various temperatures ranging from below the glass transition temperature to the equilibrium liquid show hardly any change with temperature. These pair distribution functions are used as targets to be reproduced by a mesoscale model of OTP which is formulated by replacing each benzene ring with a single interaction center. The potentials are obtained by Iterative Boltzmann Inversion of the distribution functions. The resulting potential depends not only on the structure but also implicitly on the temperature at which it was optimized. Potentials optimized in the liquid range lead to crystalline structures if used below the glass transition requiring independent optimizations in the glass. We compare potentials optimized in both ranges to study the system over the whole temperature range. The dynamic mapping turns out to be different for different mapping potentials. [ABSTRACT FROM AUTHOR]