Tropaine or Tropeine: How To spell?

The word Tropaine is misspelled against Tropeine, a noun meaning "Any one of a series of artificial ethereal salts derived from the alkaloidal base tropine."

Word contains consecutive vowels 'EI' in between alphabets trop & ne is misspelled as 'AI'
Wrong Spelling:  trop-ai-ne 
Correct Spelling:  trop-ei-ne 
Find more incorrect spellings of Tropeine to spell right way.