URGENT.....HELP!!

1. determine the molecular formula
2. draw a structure that is consistent with the formula
3. Mark the [M]⁺, [M+1]⁺, [M+2]⁺ peaks (if present).

100- MS-NU-3731 80- 60- m/z 43.0 44.0 53.0 54.0 55.0 56.0 57.0 67.0 70.0 99.0 100.0 peak intensity 21.8 1.2 1.2 1.6 1.9 100.0 5.0 1.4 6.1 11.4 0.75 Relative Intensity 40- 20- 0 10 TTTTTTT 90 20 30 40 50 60 70 80 100 m/z