Component of the RIX1 complex required for processing of ITS2 sequences from 35S pre-rRNA. Component of the RIX1 complex, composed of ipi1, rix1/ipi2 and crb3/ipi3 in a 1:2:2 stoichiometry. The complex interacts (via rix1) with mdn1 (via its hexameric AAA ATPase ring) and the pre-60S ribosome particles. Belongs to the IPI1/TEX10 family.