Patent number 371130 has been granted to GILEAD SCIENCES, INC,  that is titled POLYCYCLIC CARBAMOYLPYRIDONE COMPOUNDS AND THEIR PHARMACEUTICAL USE. During the patent prosecution, the patent examiner objected to this patent under section 3(d) of the Indian Patents Act. The patent applicant responded to this objection by stating that the compound of the invention W is -CHZ2 -, Zl and Z2 are taken together to form L, and either L is C(Ra )2C(Ra )2- and Z4 is -CH2-, or L is -C(Ra )2- and Z4 is -CH2CH2-, wherein in both instances each Ra is hydrogen. This patent falls under the category of Chemical. Overall, this patent cover compounds used for the treatment of human immunodeficiency virus (HIV) infection. The compounds have the Formula including stereoisomers and pharmaceutically acceptable salts.