--- loncom/homework/default_homework.lcpm	2004/10/05 20:30:17	1.89
+++ loncom/homework/default_homework.lcpm	2004/10/11 16:31:34	1.90
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA 
 # used by lonxml::xmlparse() as input variable $safeinit to Apache::run::run()
 #
-# $Id: default_homework.lcpm,v 1.89 2004/10/05 20:30:17 albertel Exp $
+# $Id: default_homework.lcpm,v 1.90 2004/10/11 16:31:34 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -514,8 +514,8 @@ sub chemparse {
 	    }
 	    next;
 	}
-	$token =~ /^\s*(\d*)(.*)/;
-	$formula .= $1 if ($1 > 1);  # stoichiometric coefficient
+	$token =~ /^\s*(\d*(?:&frac\d\d)?)(.*)/;
+        $formula .= $1 if ($1 ne '1');  # stoichiometric coefficient
 	
 	my $molecule = $2;
 	# subscripts