The infrared spectrum of HC 15NO an isotopically substituted species of fulminic acid, has been measured in the range 1900-3600 cm −1 at a resolution of 0.003 cm −1 with a Bruker IFS 120 HR interferometer. More than 100 subbands have been assigned. Power series coefficients for these transitions are given. A Coriolis resonance between the levels 01002 ( l = 0 e) and 01010 ( l = 1 e) allows normally "forbidden" transitions to occur, some of which were observed and assigned. We correlate transition intensities and energies of the resonance system. Variations in the manifold of nν 5 states with excitation of other modes are compared.