Sparteene or Sparteine: How To spell?

The word Sparteene is misspelled against Sparteine, a noun meaning "A narcotic alkaloid extracted from the tops of the common broom (Cytisus scoparius, formerly Spartium scoparium), as a colorless oily liquid of aniline-like odor and very bitter taste."

Word contains consecutive vowels 'EI' in between alphabets spart & ne is misspelled as 'EE'
Wrong Spelling:  spart-ee-ne 
Correct Spelling:  spart-ei-ne 
Explore spell check of Sparteine to spell without errors.