Fig. 4From: Spectroscopic details on the molecular structure of pyrimidine‑2‑thiones heterocyclic compounds: computational and antiviral activity against the main protease enzyme of SARS-CoV-2Calculated IR spectra of heterocyclic compounds at B3LYP/6-31G (d,p) level where. a compound L1, b compound L2, c compound L3, d compound L4, e compound L5Back to article page