Disclosed are hydrates and polymorphs of 4-[[(7R)-8-cyclopentyl-7-ethyl-5,6,7,8-tetrahydro-5-methyl-6-oxo-2-pteridinyl]Amino]-3-methoxy-N-(1-methyl-4-piperidinyl)-benzamide: processes for preparing them and their use as pharmaceutical compositions with antiproliferative activity.本發明係關於新穎4-[[(7R)-8-環戊基-7-乙基-5,6,7,8-四氫-5-甲基-6-酮基-2-喋啶基]胺基]-3-甲氧基-N-(1-甲基-4-六氫吡啶基)-苯甲醯胺水合物及多晶型物、彼等之製造方法及彼等作為醫藥組合物之用途。