"Relief sculpture in stone and plaster on the north facade of the room is in the Chenes open-serpent-mouth motif in the general character of Str. II at this site and Str. II, Chicanna, but markedly compressed laterally. Ruppert described this motif as bounded by vertical rows of masks; they may be compared to those at Str. XX, Chicanna."
David F. Potter, Maya Architecture of the Central Yucatan Peninsula, Mexico, 1977: p. 99