US Patent 10377764 Tricyclic heterocyclic compounds as phosphoinositide 3-kinase inhibitors

The invention relates to a compound of formula I: (I) or a pharmaceutically acceptable salt thereof, wherein each R3 is independently selected from H, halo, fluorinated C1-C10 alkyl, —I—C1-C10 alkyl, —NH—C1-C10 alkyl, —S—C1-C10 alkyl, —O-fluorinated C1-C10 alkyl, —NH-acyl, —NH—C(O)—NH-alkyl, —C—(O)—NH-alkyl, with the proviso that at least one of R3 is not H.