1,4-Dihydropyiridine derivative, a process for preparing the same, a pharmaceutical composition as well as the use thereof
申请人:Eisai Co., Ltd.
公开号:EP0197488A2
公开(公告)日:1986-10-15
A novel 1,4-dihydropyridine derivative is disclosed having the formula:
This derivative and pharmacologically acceptable salts thereof are effective for the treatment and prevention of cardiopathy and antihypertensive and coronary vasodilating action.
There is also described a process for the preparation of the claimed 1,4-dihydropyridine derivative, a pharmacological composition containing the same and the use thereof.
POLYIMIDE PRECURSOR COMPOSITION, AND WIRING CIRCUIT BOARD EMPLOYING THE COMPOSITION
申请人:Hishiki Tomoaki
公开号:US20130118788A1
公开(公告)日:2013-05-16
A polyimide precursor composition comprises (A), and at least one of (B) and (C), (B) and (C) being present in a proportion of 30-100 parts by weight based on 100 parts by weight of (A):
(A) a polyimide precursor comprising:
(a1) a unit of formula (1):
R
1
is a C
1
-C
3
alkyl group connected to an aromatic ring, m is 0 or not greater than 4, and n is 1 to 4; and
(a2) a unit of formula (2):
(a1) and (a2) are present in a molar ratio of 20/80 to 70/30;
(B) a compound of formula (3):
R
2
is a hydrogen atom or a methyl group, and R
3
is a
divalent hydrocarbon group having two or more carbon atoms; and
(C) a compound of formula (4):
R
4
is a hydroxyl group or a methoxy group, R
5
is a hydrogen
atom or a methyl group, and k is 4-23.