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Logic Puzzle #24: Conflicting Masses?

The purpose of this puzzle is to examine data collected from multiple detectors with the hopes of sorting out the conflicting data surrounding the unknown.

In an attempt to identify the structure for an unknown, UPLC data was collected using a C18 column with a run time of 2.2 minutes. The UV, ESI- and ESI+ traces are presented for the unknown eluting at 1.8 minutes. What is the mass of the unknown?