Betalains are a class of red and yellow indole-derived pigments found in plants of the Caryophyllales, where they replace anthocyanin pigments. Betalains also occur in some higher order fungi. They are most often noticeable in the petals of flowers, but may color the fruits, leaves, stems, and roots of plants that contain them. They include pigments such as those found in beets.

Answer this question: what is the name of the pigment found in beetroot cells? Let's think fast. Stream of consciousness:
This is the relevant information: They include pigments such as those found in beets. So the final answer is Betalains.