3,4-Dihydro-2H-pyran-5-carboxaldehyde, 97%..
3,4-Dihydroxy-3-cyclobutene-1,2-dione, 99%..
3,4-Dihydroxybenzylamine hydrobromide, 98%..
3,4-Dihydroxycinnamic acid, 99+%, predominantly trans isomer..
3,4-Dihydroxycinnamic acid, 99+%, predominantly trans isomer..
3,4-Dimethoxybenzenesulfonyl chloride, 97%..