Two polymorphs, with z′ = 1 and 2, of 2-amino-4-chloro-6-morpholinopyrimidine in P21/c, and 2-amino-4-chloro-6-piperidinopyrimidine, which is isomorphous and almost isostructural with the Z′ = 2 polymorph

1. Bowes, K.F.
2. Glidewell, C.
3. Low, J.N.
4. Melguizo, M.
5. Quesada, A.