The present invention relates to compounds of formula I: in which n, m, X, Y1, R1, R2, R3, R4 and R5 are defined in the Summary of the Invention; capable of being both potent antagonists and degraders of estrogen receptors. The invention further provides a process for the preparation of compounds of the invention, pharmaceutical preparations comprising such compounds and methods of using such compounds and compositions in the management of diseases or disorders associated with aberrant estrogen receptor activity.本發明係關於式I化合物:其中n、m、X、Y1、R1、R2、R3、R4及R5係於發明內容中定義;該等化合物能夠為雌激素受體之有效拮抗劑與降解子二者。本發明進一步提供製備本發明化合物之製程、包含此等化合物之醫藥製劑及使用此等化合物及組合物管控與異常雌激素受體活性相關之疾病或病症之方法。