ki te wahi i raro nei, a ka whakahoki i te pātai i muri i roto i te reo ano rite te wahi: Passage: Ko te whanganga absorption optical o pyridine i roto i hexane kei roto i toru ngā kāwai i te roangaru o 195 nm (π → π* whakawhiti, molar absorptivity ε = 7500 L·mol−1·cm−1), 251 nm (π → π* whakawhiti, ε = 2000 L·mol−1·cm−1) me te 270 nm (n → π* whakawhiti, ε = 450 L·mol−1·cm−1). Ko te 1H karihi magnetic resonance (NMR) whanganga o pyridine kei roto i toru tohu ki te kaha integral ōwehenga o 2: 2: 2 e ōrite ki te toru matū rerekē protons i roto i te rāpoi ngota: enei tohu puta i te α-protons (nga tūranga 2 me te 6, 8.5 ppm), pyridine-proton (nga tūranga 4, 7.5 ppm) me te β-protons (nga tūranga 3 me te 5 ppm). Ko te hua o te whang
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