When using UPLC-Q-TOF-MS, why the mass spectra of some standards has a ion of [2M+85]?

27 June 2020 0 9K Report

When using UPLC-Q-TOF-MS, the mass spectra of some standards has a ion of [2M+85], I want to know what is the structure the [85] represents?

I attach the mass spectrum of Diisopropyl phthalate (CAS: 605-45-8, Mw: 250.1205).

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