Santoninate is a rare word used in organic chemistry describing a specific molecular structure. The spelling of the word is pronounced /san-ton-in-ate/. The first syllable "san" is pronounced like "sun", the second syllable "ton" is pronounced like "tun", the third syllable "in" is pronounced like "in", and the final syllable "ate" is pronounced like "eight". The word derives from "santonin", a crystalline compound, and "-ate", indicating the presence of a carboxylate moiety in the molecule. Overall, the word's complex spelling reflects the complex nature of the chemical compound it describes.