Formula 

Exact
mass for M 
C_{2}H_{6}O_{3}  (2 x
12.0000) + (6 x 1.007825) + (3 x 15.994915) = 78.0317 

C_{3}H_{7}Cl  (3 x
12.0000) + (7 x 1.007825) + (1 x 34.968853) = 78.0236 

C_{5}H_{4}N  (5 x
12.0000) + (4 x 1.0007825) + (1 x 14.003074) = 78.0062 

C_{6}H_{6}  (6 x
12.0000) + (6 x 1.007825) = 78.0470 