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[en] A theoretical investigations on the stability, mechanical and electronic properties of Pbca-CN was performed by using first principle calculations. According to our calculations, Pbca-CN exhibits a large elastic anisotropy. The further mechanical calculations demonstrated that Pbca-CN shows high elastic moduli. Young's modulus of Pbca-CN is found to reach a maximum along  direction and a minimum along  direction. The ideal tensile and shear strength at large strains of Pbca-CN are also examined. The ideal shear strength along the weakest (100) slip system is about 20 GPa, which shows Pbca-CN is not an intrinsic superhard material. - Highlights: • Pbca-CN is stable up to at least 100 GPa. • Pbca-CN exhibits a large elastic anisotropy. • Pbca-CN is an ultra-incompressible material. • The ideal strength calculations show that Pbca-CN is not an intrinsic superhard material.