This invention relates to novel compounds and hydrochloric acid salts thereof. More specifically, this invention relates to novel compounds and hydrochloric acid salts thereof derived from erlotinib. This invention also provides compositions comprising one or more compounds of this invention and a carrier and the use of the disclosed compounds and compositions in methods of treating diseases and conditions that are beneficially treated by administering an epidermal growth factor receptor tyrosine kinase (EGFR) inhibitor, such as erlotinib.