Claims
- 1. A compound having the formula: ##STR25## wherein: R.sub.1, R.sub.2, and R.sub.3 are independently selected from sulfur protecting groups;
- X.sub.1 and X.sub.2 are independently selected from H and an alkyl group of C.sub.6 or less;
- X.sub.3 is H, an alkyl group of C.sub.6 or less, or Z;
- X.sub.4, X.sub.5, and X.sub.6 are independently selected from H and =0, with the provisos that X.sub.4 is H when X.sub.1 is an alkyl group, that X.sub.5 is H when X.sub.2 is an alkyl group, and that X.sub.6 is H when X.sub.3 is an group or Z;
- Q is H or a polar group to increase the hydrophilicity of the compound;
- n is 0 to 4; and
- Z is --(W).sub.m --R', where W is --CH.sub.2 --, --CH.sub.2 --O--, --CH.sub.2 --CO--, or combinations thereof, m is 0 to 5, and R' is a chemically reactive group.
- 2. The compound of claim 1 wherein said compound has the formula: ##STR26##
- 3. The compound of claim 1 wherein said compound has the formula: ##STR27##
- 4. The compound of claim 1 wherein said compound has the formula: ##STR28##
CROSS-REFERENCE TO RELATED APPLICATION
This application is a division of U. S. patent application Ser. No. 07/804,123, filed Dec. 6, 1991, issued Jul. 25, 1995, as U.S. Pat. No. 5,436,352; which application is a division of U.S. patent application Ser. No. 07/589,449, filed Sep. 27, 1990, issued Dec. 24, 1991, as U. S. Pat. No. 5,075,099; which application is a division of U. S. patent application Ser. No. 07/201,134, filed May 31, 1988, issued Jan. 29, 1991, as U. S. Pat. No. 4,988,496.
US Referenced Citations (6)
Number |
Name |
Date |
Kind |
4444690 |
Fritzberg |
Apr 1984 |
|
4670545 |
Fritzberg et al. |
Jun 1987 |
|
4897255 |
Fritzberg et al. |
Jan 1990 |
|
5175257 |
Kasina et al. |
Dec 1992 |
|
5175343 |
Fritzberg et al. |
Dec 1992 |
|
5218128 |
Dean et al. |
Jun 1993 |
|
Divisions (3)
|
Number |
Date |
Country |
Parent |
804123 |
Dec 1991 |
|
Parent |
589449 |
Sep 1990 |
|
Parent |
201134 |
May 1988 |
|