3-(3-hydroxypropyl)-8-[(E)-2-(3-methoxyphenyl)ethenyl]-7-methyl-1-prop-2-ynylpurine-2,6-dione

8-(m-methoxystyryl)-3-methyl-1-propargylxanthine

8-[(E)-2-(3-Methoxy-phenyl)-vinyl]-3,7-dimethyl-1-prop-2-ynyl-3,7-dihydro-purine-2,6-dione

8-[(E)-2-(3-Hydroxy-phenyl)-vinyl]-3,7-dimethyl-1-prop-2-ynyl-3,7-dihydro-purine-2,6-dione

3-(2-hydroxyethyl)-8-(m-methoxystyryl)-1-propargylxanthine