# How would you draw tryptophan and select the chiral carbon?

The chiral carbon, if there is one, tends to be the $\setminus m a t h b f \alpha$ carbon on an amino acid.
You can see the chiral carbon highlighted. You can tell that it's an $s {p}^{3}$ carbon and that it has four different substituents on it ($\text{H}$, ${\text{NH}}_{3}^{+}$, ${\text{COO}}^{-}$, and $\text{CH"_2-"stuff}$). Therefore it's chiral.