iterative 1H NMR analysis 11028-42-5 1 1H-1H coupling constants 1 1β-angeloyloxyeudesm-7-ene-4β,9α-diol 1 63ZM9703BO 1 7β-angeloyloxy-1-methylene-8α-pyrrolizidine 1 CBS-4M method 1 mehr ... Journal Article 1 Letter 1 PERCH spin-spin simulation 1 Polycyclic Sesquiterpenes 1 Protons 1 Pyrrolizidine Alkaloids 1 Research Support, Non-U.S. Gov't 1 Senecio polypodioides 1 Sesquiterpenes 1 Sesquiterpenes, Eudesmane 1 Terpenes 1 cedrane derivatives 1 cedrene 1 cedrol 1 conformational behavior 1 neosarracine N-oxide 1 pipitzol 1 sarracine 1 sarracine N-oxide 1 weniger ...