Write the molecular formula for a compound with the possible elements C, H, N and O that

Question:

Write the molecular formula for a compound with the possible elements C, H, N and O that exhibits a molecular ion at M+ = 122.037. Exact Masses of the Most Abundant Isotope of Selected Elements
Isotope_ Natural abundance (%)_ Exact mass
1H_ 99.985_ 1.008
12C _98.90 _12.000
14N _99.63_ 14.003
16O _99.76 _15.995