Hello, I am currently doing a method optimization for chloramphenicol using our lab's tandem mass spec. I have done Q1 scan (prec ion: 320.10 m/z) and did MRM scan for three product ion. Upon injecting my stds, I noticed that no spectral peak was detected for my third product ion. What seems to be the problem?

Note: I am using ESI, Triple quad and negative mode. My mobile phases are: A: Methanol + 0.1% Formic acid, B: Water + 0.1% Formic acid

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