The following code demonstrates how to parse these sort of tags:

#!/usr/bin/perl -w

use strict;

while (<DATA>) {
   if (/\${4}/) {
      print "End of record\n";
      last;
   }
   next unless /^> <([^>]+)>$/;
   my $tag = $1;
   chomp( my $property = <DATA>);
   print "tag: $tag   property: $property\n";
}


__DATA__
(+)-catechin
  SMI2MOL 

 21 23  0  0  0  0  0  0  0  0999 V2000
    0.0000    0.0000    0.0000 O   0  0  0  0  0  0  0  0  
    0.0000    0.0000    0.0000 C   0  0  1  0  0  0  0  0  
    0.0000    0.0000    0.0000 C   0  0  0  0  0  0  0  0  
  1  2  1  0  0  0  0
  2 13  1  0  0  0  0
 19 21  1  0  0  0  0
M  END
> <$NAM>
(+)-catechin

> <Formula>
C15H14O6

> <MolWeight>
290.26806

> <ChemBankID>
1254

> <CompoundName>
(+)-catechin

> <Calbiochem Catalog>
219250

> <MicroSource Catalog>
210205

$$$$
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Once you have the tags, you can write glue code to insert the record into a database.