tert-Butyl (4-bromothiophen-2-yl)carbamate868387-45-531 % similar 1,3-Dibromobenzene108-36-130 % similar 1,4-Dibromobenzene106-37-630 % similar 6-Bromobenzo[b]thiophene17347-32-930 % similar 5-Bromobenzo[B]thiophene4923-87-930 % similar