The tilts along the b and c directions in 3 are complex, that is, the repeat distance for the tilt pattern is greater than two unit cells (i.e. the tilts transform as a [00k]T 2 irrep) [Fig. ]. There are very few examples of perovskites with complex tilts, and perhaps the best known is LiNbO 3 , which forms phases possessing tilts with periodicities of four (S-phase) and six (R-phase) unit cells along a single axis. Complex tilting has also been observed in molecular perovskites, with incommensurate tilting discovered in Me 2 NH 2 {Co(HCO 2 ) 3 } 62 and complex tilts along multiple axes in Me 2 NH 2 {Mn(H 2 PO 2 ) 3 } . In both cases the tilts are unconventional as they are formed from shifts and/or out-of-phase tilts (where adjacent octahedra tilt in the same sense). Compound 3 is the first perovskite of any kind, to our knowledge, to show complex conventional tilts along multiple axes.