Skip to main content
. Author manuscript; available in PMC: 2019 Nov 28.
Published in final edited form as: J Chromatogr B Analyt Technol Biomed Life Sci. 2018 Jun 19;1092:447–452. doi: 10.1016/j.jchromb.2018.06.040

Figure 1:

Figure 1:

Mass spectra showing both the precursor and product ions of acyclovir (ACV) (A), valacyclovir (VACV) (C), and their isotope-labeled internal standards ACV-D4 (B) and VACV-D4 (D).