At first choose type of standards. In this sample it is "NF".
Onward select standard.
On the left you see list of alloys which appertain to correspondent standard.
After activation one’s items, e.g . "CuZn 33 PbY 20"  lower will portray chemical composition of this alloy.
By activate items "Equivqalent materials" from menus on the right will portray such materials, lower.
Choose e.g . item "2.0290" and down you will see chemical composition of this alloy.