4-[4-(4-Chloro-phenoxy)-but-2-ynyloxy]-chromen-2-one
6-{[4-(4-Chloro-phenoxy)-but-2-ynyl]-methyl-amino}-1-methyl-1H-quinolin-2-one
3-[4-(4-Chloro-phenoxy)-but-2-ynyloxy]-1-methyl-1H-quinolin-2-one
5-{N-[4-(4'-chlorophenoxy)but-2-ynyl]-N-ethylamino}-1,3-dimethyluracil
4-[4-(4'-chlorophenoxy)-but-2-ynyloxy]-6-methyl-2-pyrone