Draw a dipeptide structure consisting of given amino acids in the following order. Remember that we have to write this from the N-terminus to the C-terminus, meaning that the amino acid on the left side will have its carboxyl group interacting with the amino group of the amino acid on the right.

This is a condensation reaction where we will have the loss of water. We are going to lose the oxygen from the carboxyl group and 2 hydrogens from the amino group. After that, everything left behind will come together to form our dipeptide structure.

We have our benzene ring with our OH group connected to this CH₂ group, which is connected to this carbon with the NH₃⁺. Next, our carboxyl group is drawn here, and I am going to draw the peptide bond in red. It's connected now to this nitrogen, which still has one of its hydrogens, and it's still connected to all this stuff here, CH₂, and then we have SH here, and then we have the carboxyl group here. This will be our dipeptide structure.

Now, we need to provide the three-letter code. The amino acid on the right is easy to spot because it has an SH group, which is unique to cysteine. Cysteine's three-letter code is CYS, based on its first three letters.

The other amino acid has an OH group, a polar group, and this one is tyrosine. Its three-letter code is TYR, again based on its first three letters. Therefore, the dipeptide we have here would be TYR-CYS. This is the dipeptide name using our three-letter code, and this is the dipeptide structure.