What's the difference between ambergris and ambrein?

Ambergris

Definition:

(n.) A substance of the consistence of wax, found floating in the Indian Ocean and other parts of the tropics, and also as a morbid secretion in the intestines of the sperm whale (Physeter macrocephalus), which is believed to be in all cases its true origin. In color it is white, ash-gray, yellow, or black, and often variegated like marble. The floating masses are sometimes from sixty to two hundred and twenty-five pounds in weight. It is wholly volatilized as a white vapor at 212¡ Fahrenheit, and is highly valued in perfumery.

Example Sentences:

(1) The island that took the top spot in the best in the world category was Ambergris Caye in Belize, a tiny island beside the second largest coral reef on the planet, which attracts divers and snorkellers.
(2) A couple walk along the beach on the island of Ambergris Caye, Belize.
(3) After sampling her tea – this absurdly precious, unerringly pretentious, wholly underwhelming ambergris spewed from the belly of a corporate leviathan – I can only wish that karma back on her.
(4) Lesions included heavy combative scarring of the head, grossly roughened and thickened skin on the lower left flank, cutaneous maculae, genital papillomatosis, partial duodenal obstruction by plastic debris, colo-rectal obstruction by ambergris, cystic degeneration of the right kidney, and a deeply ulcerative gastric nematodiasis.
(5) Even sperm whale excretions – in the form of ambergris – are the most valuable natural substances known to us, still used as a fixative in high-fashion perfumes.
(6) The compound ambrein was isolated from ambergris, which is commonly used as an analgesic in the Saudi folklore medicine.

Definition:

Example Sentences:

(1) Results suggested that the hypoglycemic activity of ambrein may be mediated by enhanced glucose utilization.
(2) Ambrein reduced the blood glucose level of normal and moderately alloxan-diabetic rats but did not reduce the blood glucose levels of severely-diabetic rats.
(3) The LD50 of ambrein, given intraperitoneally (i.p.)
(4) In the hotplate test, ambrein was found to possess antinociceptive activity in mice at doses which did not sedate or incapacitate the animals.
(5) The possible mechanism of ambrein antinociception is discussed.
(6) The compound ambrein was isolated from ambergris, which is commonly used as an analgesic in the Saudi folklore medicine.
(7) Ambrein did not reduce the hyperglycemia of glucose-loaded rats also given mannoheptulose but it reduced the hyperglycemia of glucose-loaded rats in the absence of mannoheptulose.