While none of these molecules have been directly detected in the ISM or CSE to date, they exhibit chemical and physical properties that make them strong candidates for future spectroscopic searches. Their energies, including zero-point energy corrections (E ), relative energies (RE), and spectroscopic properties such as rotational constants and dipole moments, are summarized in Table and. These properties are essential for guiding observational efforts, particularly for molecules like CH 2 NCHO and NHCHCHO, which have distinct spectroscopic signatures that enhance their detectability through microwave spectral line analysis.