Credit: Image courtesy of N.A. Vermeulen
NU-1301 is composed of cuboctahedral building blocks (blue) that organize into pentagonal and hexagonal (yellow and red) prismatic secondary structures resulting in the formation of colossal icosidodecahedral (grey) and rectified hexakaidecahedral (green) cavities with internal diameters of 5.0 nm and 6.2 nm, respectively. The cages are measured in Angstroms.