The present invention relates to novel Triheterocyclic Compounds, compositions comprising a Triheterocyclic Compound, and methods useful for treating or preventing cancer or a neoplastic disorder comprising administering a Triheterocyclic Compound. The compounds, compositions, and methods of the invention are also useful for inhibiting the growth of a cancer cell or neoplastic cell, treating or preventing a viral infection, or inhibiting the replication and/or infectivity of a virus.