Bis-dioxopiperazine derivatives and process for preparation thereof
CA 1279642 C · Owner: Takase, Muneaki · Inventors: Takase, Muneaki; Cai, Jun-Chao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are bis-dioxopiperazine derivatives and process for preparation thereof. The, bis-dioxopiperazine derivatives are represented by the following formula (I):, (I), wherein R1 represents an alkyl group having 1 to 6 carbon atoms; A represents an oxygen atom a sulfur atom, or a group of , or , wherein R2 represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms or phenyl; R3 represents an alkyl group having 1 to 6 carbon atoms, phenyl or benzyl; and X and Y which are, respectively independent and are the same or different represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. The compounds(I) have antitumor activity.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 29, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 29, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.