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How does the chemical inside the monarch butterfly and viceroy butterfly make the bird who tries to eat it sick?

Relevant answers:

What birds eat monarch butterflies?
Monarch butterflies are distasteful to birds and other predators of the monarch butterfly because monarch butterflies eat milkweed which makes them taste bad
Is the Viceroy butterfly a Monarch butterfly?
no but it only mimics it
Do birds eat monarch butterflies?
Yes.
Monarch butterflies are toxic to birds monarch caterpillars eat?
Some birds and other animals find the toxins in a Monarch caterpillar or butterfly extremely distateful. They can become sick after eating a Monarch buterfly. Other birds quite happily eat Monarch...
What plant do monarch butterflies eat?
Monarch caterpillars feed on milkweed leaves. Adult monarchs feed on nectar from various plants.