Claims
- 1. A compound of the formula ##STR10## wherein R.sup.21 is (C.sub.1 -C.sub.3)alkyl and R.sup.22 is hydrogen or (C.sub.1 -C.sub.3)alkyl.
- 2. A compound of formula ##STR11## wherein R.sup.21 is (C.sub.1 -C.sub.3)alkyl and R.sup.22 is hydrogen or (C.sub.1 -C.sub.3)alkyl, which contains a tracer amount of radiolabeling.
- 3. The compound according to claim 2 wherein said radiolabel is selected from tritium and carbon-14.
- 4. The compound according to claim 3 wherein said radiolabel is tritium.
- 5. The compound according to claim 3 wherein said radiolabel is carbon-14.
Parent Case Info
This is a continuation-in-part of application Ser. No. 07/648,677 filed Mar. 21, 1991, now abandoned, which is a continuation-in-part of PCT patent application PCT/U.S. 89/04033, filed Sep. 15, 1989.
US Referenced Citations (5)
Non-Patent Literature Citations (3)
Entry |
Kirk-Othmer "Concise Encyclopedia of Chemical Technology" Wiley Interscience Publish, pp. 989-999 (1990). |
Bennett "Concise Chemical and Technical Dictionary" Chemical Publishing, p. 885 (1976). |
Kepler "Preparation of C.sup.14 and T-labeled compounds" CA:106:67055x (1987). |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
648677 |
Mar 1991 |
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