Year of launch Achiral drugs Achiral drugs Chiral mixtures Chiral mixtures Pure enantiomers Pure enantiomers Total Total
n % n % n % n %*
Before 1920 17 70.8 1 4.2 6 25.0 24 6.1
1920-1940 15 53.6 7 25.0 6 21.4 28 7.1
1940-1960 48 51.6 24 25.8 21 22.6 93 23.5
1960-1980 74 51.0 46 31.7 25 17.2 145 36.7
1980-2000 42 48.3 30 34.5 15 17.2 87 22.0
After 2000 11 61.1 1 5.6 6 33.3 18 4.6
Total 207 52.4 109 27.6 79 20.0 395 100.0