Enamine is planning to change the numbering of products offered through screening collections in 2012. To facilitate compound tracking in different offerings and allow transparent identification of structures by their unique ID throughout various databases, the old identification method utilizing lot-related T-numbers will be ceased. According to the new identification system all structures referring to compounds offered by Enamine for screening will have unique Z-codes familiar to those who worked with REAL Database before. Existing T-codes will be supported for ordering purposes.