Hexaykosane or Hexeikosane: How To spell?

The word Hexaykosane is misspelled against Hexeikosane, a noun meaning "A hydrocarbon, C26H54, resembling paraffine; -- so called because each molecule has twenty-six atoms of carbon."

Word contains consecutive vowels 'EI' in between alphabets hex & kosane is misspelled as 'AY'
Wrong Spelling:  hex-ay-kosane 
Correct Spelling:  hex-ei-kosane 
Find more incorrect spellings of Hexeikosane to spell right way.