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. Author manuscript; available in PMC: 2019 Jul 26.
Published in final edited form as: ACS Catal. 2019 Apr 11;9(6):4764–4776. doi: 10.1021/acscatal.9b00231

Figure 6.

Figure 6

High-resolution mass spectrometry analyses of the isotope labeling reaction using 18O-enriched H2O2 (left panels) or H2O (right panels). Only DOPA (1a) was produced when L-tyrosine was used as a substrate (A), while both 1a and 3-fluoro-5-hydroxyl-tyrosine (5a) (B) were observed using 3-fluoro-L-tyrosine as substrate. 1a and 5a have molecular weight of 198.0761 and 216.0667 Da with natural abundance.