The skin secretion of the giant leaf frog is known as Vacina do sapo (frog vaccine)  and contains the opioid peptides deltorphin, deltorphin I, deltorphin II and dermorphin.
The skin secretion of the giant leaf frog is referred to as Vacina do sapo (frog vaccine) and contains opioid peptides similar to deltorphin, deltorphin I, deltorphin II, and dermorphin.