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US 5,476,848 AGranted
14B(R) isomers of novel tetracyclic compounds having anti-allergic and anti-asthmatic activities, and their use
AssigneeSankyo Company, Limited
InventorsHiroshi Fukumi, Toshiaki Sakamoto, Mitsuo Sugiyama, Yoshio Iizuka, Takeshi Yamaguchi
Life of this patent
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Abstract
An optically active compound of formula (I): ##STR1## in which R.sup.3 represents groups of formula --A--COOR.sup.4, wherein A represents alkylene groups having 3 or 5 carbon atoms and R.sup.4 represents hydrogen or an alkyl group having 1 to 4 carbon atoms; or a pharmaceutically acceptable salt thereof.
Claims8
An optically active compound of formula (I):
- ##STR20## in which R.sup.3 represents groups of formula --A--COOR.sup.4, wherein
- A represents alkylene groups having 3 or 5 carbon atoms and
- R.sup.4 represents hydrogen or an alkyl group having 1 to 4 carbon atoms;
- or a pharmaceutically acceptable salt thereof.
1 more element
Dependencies are inferred from the claim text.