Solid forms of an HPK1 inhibitor

A salt which is an acid salt of N-(2-((2S,4S)-4-Amino-2-(hydroxymethyl)pyrrolidin-1-yl)-5-fluorophenyl)-2-(2-fluoro-6-methoxyphenyl)pyrimidine-4-carboxamide, having the structure:

• wherein the acid is selected from phosphoric acid, hydrochloric acid, L-(+)-tartaric acid, malic acid, camphorsulfonic acid, mandelic acid, and citric acid, wherein the salt is crystalline, and wherein:
• the phosphoric acid salt of Compound 1 has at least one characteristic XRPD peak selected from about 6.3, about 6.4, about 7.0, about 8.9, about 11.2, about 12.5, about 19.9, and about 22.9 degrees 2-theta;
• the hydrochloric acid salt of Compound 1 has at least one characteristic XRPD peak selected from about 6.7, about 9.1, about 11.0, about 12.7, about 13.5, about 15.5, about 17.1, and about 23.4 degrees 2-theta;
• the L-(+)-tartaric acid salt of Compound 1 has at least one characteristic XRPD peak selected from about 4.9, about 7.9, about 9.8, about 15.9, about 16.9, about 19.6, and about 23.0 degrees 2-theta;
• the malic acid salt of Compound 1 has at least one characteristic XRPD peak selected from about 5.2, about 7.9, about 10.4, about 14.3, about 15.8, about 16.6, about 18.0, about 21.0, and about 21.2 degrees 2-theta;
• the camphorsulfonic acid salt of Compound 1 has at least one characteristic XRPD peak selected from about 4.9, about 5.9, about 10.9, about 14.4, about 15.0, about 15.1, about 19.8, about 20.1, and about 25.8 degrees 2-theta;
• the mandelic acid salt of Compound 1 has at least one characteristic XRPD peak selected from about 4.2, about 5.0, about 5.4, about 5.8, about 6.9, about 14.2, about 15.3, about 19.0, and about 19.6 degrees 2-theta;
• and
• the citric acid salt of Compound 1 has at least one characteristic XRPD peak selected from about 7.3, about 9.0, about 13.6, about 16.6, about 18.1, about 18.3, about 19.5, about 20.1, and about 20.9 degrees 2-theta.

A salt which is an acid salt of N-(24(2S,4S)-4-Amino-2-(hydroxymethyl)pyrrolidin-1-yl)-4-(4-cyanopyridin-3-yl)phenyl)-2-(2-fluoro-6-methoxyphenyl)pyrimidine-4-carboxamide, having the structure:

• wherein the acid is selected from phosphoric acid and hydrochloric acid, wherein the salt is crystalline, and wherein:
• the phosphoric acid salt of Compound 2 has at least one characteristic XRPD peak selected from about 5.9, about 6.7, about 10.2, about 13.4, about 14.5, about 15.5, about 16.5, about 17.4, and about 18.0 degrees 2-theta;
• and
• the hydrochloric acid salt of Compound 2 has at least one characteristic XRPD peak selected from about 6.2, about 6.8, about 11.2, about 12.5, about 13.6, about 17.3, about 18.4, about 21.6, and about 22.3 degrees 2-theta.