Spermidine  => N-acetylated spermidine (Drosophila melanogaster)
spermidine  => n-acetylated spermidine (drosophila melanogaster)
Spermidine  => N-acetylated spermidine (Drosophila melanogaster)
spermidine  => n-acetylated spermidine (drosophila melanogaster)