I have SNPs from the Illumina 2.5M quad chip that are definitely in dbSNP, but for which I only have genome positions (build 37) not RSids. I want the RSids. I'm sure I should be able to do this with Biomart but I just can't work out how!

I'm preferably looking for a way to do this that doesn't need me to be able to use Biomart's Perl API, but all suggestions welcome.

The data looks like this: Chr Name Pos (37) 1 SNP1-61575582 61802994

I can obviously change the way this looks to make it compatible with whatever upload/input format is needed :)

I want output that would tell me both the RSid number and the genome position.