We report X-ray layer spacing, dielectric constant and high pressure measurements on a compound that exhibits the following sequence of phase transitions : smectic A-ferroelectric smectic C*-ferrielectric smectic C-gamma*-antiferroelectric smectic C-A*-hexatic antiferroelectric smectic I-A*-crystal K. The pressure-temperature diagram shows two three-phase meeting points, which are topologically consistent with critical end points, and reentrant behavior of the C* and C-7* phases as the pressure is varied at constant temperature.