Below is the arrow-pushing reaction mechanism for the conversion of molecule 59 to molecule 60. This mechanism involves three distinct steps. First, molecule 59 is oxidized by DDQ. Then, the resulting intermediate is oxidized again, this time by DMP. Finally, the second intermediate undergoes a Wittig reaction, forming molecule 60. Aqueous NaHCO3 is used as a quench for the first and second steps, and NH4Cl is used as a quench for the third step.

Three steps in a GIF:

This is our mechanism,

before Mount Fuji