1H-Purine-2,6-dione, 8-[(3R)-3-amino-1-piperidinyl]-7-(2-butyn-1-yl-4,4,4-d3)-3,7-dihydro-3-methyl-1-[(4-methyl-2-quinazolinyl)methyl]-; 8-[(3R)-3-Amino-1-piperidinyl]-7-(2-butyn-1-yl-4,4,4-d3)-3,7-dihydro-3-methyl-1-[(4-methyl-2-quinazolinyl)methyl]-1H-p