How many syllables in serotonin?

There are 4 syllables in the word serotonin.

How to pronounce serotonin:

serotonin (noun):: a neurotransmitter involved in e.g. sleep and depression and memory.; a phenolic amine neurotransmitter c10h12n2o that is a powerful vasoconstrictor and is found especially in the brain, blood serum, and gastric mucous membrane of mammals

Here are some other common words that have 4 syllables, like serotonin does.

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