Русский Стандарт (Russian Standard) is a pirate label, releasing music on cassettes & CD.
The barcode is '6 456489 431561' (6456489431561) on all or on most of CD releases.
Cat# of CD releases usually appears on back cover, near the barcode.
Some releases may also have 'N CD 0120' printed on back cover, near the barcode (can be added to release description as BAOI->Other). This is not a cat#, because this identifier is not unique and appears on many different releases.