TY JOUR TI HIGH-PRECISION CALCULATION OF 1H AND 13C NMR CHEMICAL SHIFTS OF STRICHNINA ALKALOIDS KW The calculation of 1H and 13C NMR chemical shifts in the series of strychnine alkaloids using the Purdue-Burke-Ernzerhof functional KW PBE0 KW with segmented Jensen basis sets of threefold splitting level pcSseg-2 and pcseg-2 KW PBE0 / pcSg-2 // pcseg-2. JO Modern Technologies and Scientific and Technological Progress AU Krivdin, L.B. AU Semenov, V.A. PY 2022 IS 2021 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»