PLEASE HELP! Please show all work to solve so it's clear to understand. Thank you!

4. A compound with the molecular formula C6H120 has a strong IR absorption at 1715 cm-1. Its mass spectrum includes key peaks at m/z 58 (base peak) and m/z 85 and m/z 43. Propose a structure for this compound and write a fragmentation equation showing how peaks with the reported m/z arise