Degradation of standard

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My diluent is:
900ml buffer (5ml Triethylamine in 1000ml water, adjusted to ph 6.8 using o-phosphoric acid.) and 50ml ACN and 50 ml MeOH.

Would this cause this structure to degrade?

It can be practically detero ny analysis.

Can you clarify and give more detail. I do not understand your answer. What is detero ny?