di-O-tert-butyl 3-O-hydroxypropyl-8-(m-methoxystyryl)-7-methyl-1-propargylxanthine phosphate triester

(E)-3-[8-[2-(3-methoxyphenyl)vinyl]-2,6-dioxo-1-prop-2-ynyl-1,2,6,7-tetrahydropurin-3-yl]propyl acetate

(E)-8-[2-(3-methoxyphenyl)vinyl]-1-prop-2-ynyl-3-(3-trimethylsilanyloxypropyl)-3,7-dihydropurine-2,6-dione