Spermidine  => N-acetylated spermidine (Xenopus tropicalis)
spermidine  => n-acetylated spermidine (xenopus tropicalis)
Spermidine  => N-acetylated spermidine (Xenopus tropicalis)
spermidine  => n-acetylated spermidine (xenopus tropicalis)