Level anti-crossings in ParaHydrogen Induced Polarization experiments with Cs-symmetric molecules

► The hydrogenation of symmetric molecules with parahydrogen is studied. ► Theoretical considerations for the behavior of a 4-spins model are presented. ► The level anti-crossing arises as the responsible for the in-phase signal pattern. ► The experiments performed on a suitable molecule confirm the theoretical spectrum. ► The dependence of the signal on the magnetic field is also experimentally verified.