The spelling of the word "sinapolin" can be explained using the International Phonetic Alphabet (IPA) transcription. The first syllable "si-" is pronounced as /sɪ/, which is a short vowel sound followed by the consonant /s/. The second syllable "-na-" is pronounced as /neɪ/, which is a diphthong consisting of the long vowel sound /eɪ/ followed by the consonant /n/. The final syllable "-polin" is pronounced as /pəʊlɪn/, which is a combination of the long vowel sound /oʊ/, the consonant /l/, and the short vowel sound /ɪn/. Thus, "sinapolin" is spelled as /sɪ.neɪ.poʊ.lɪn/.
Diallyl urea, obtained from oil of mustard.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.