Why does the Titan arum (flor cadáver) smell so bad?

The Amorphophallus titanum , known as the titan arum , is a flowering plant with the largest unbranched inflorescence (number of flowers in the branch) in the world.

The titan arum's inflorescence is not as large as that of the talipot palm, but the inflorescence of the talipot palm is branched rather than unbranched.

Due to its odor, which is like the smell of a rotting animal, the titan arum is characterized as a carrion flower, and is also known as thecorpse flower, or corpse plant .

It is native only from western Sumatra, where it grows in openings in rainforests on limestone hills. But , The plant is cultivated by botanic gardens and private collectors around the world.

The titan inflorescence each over 3 metres  in height.   it consists of a fragrant spadix of flowers wrapped by a spathe, which looks like a large petal. In the case of the titan arum, the spathe is a deep green on the outside and dark red on the inside, with a deeply soft texture .Near the bottom of the spadix, hidden from view inside the sheath of the spathe, the spadix bears two rings of small flowers. The upper ring bears the male flowers, the lower ring is spangled with bright red-orange carpels.

The odor of the titan arum resembles rotting meat, attracting carrion-eating beetels and flesh flies that pollinate it. The inflorescence's deep red color and texture contribute to the illusion that the spathe is a piece of meat. During bloom, the tip of the spadix is approximately human body temperature, which helps the perfume volatilize; this heat is also believed to assist in the illusion that attracts carcass-eating insects.

That is why the titan arum smells so bad and a description of it .