substituent
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substituent 〔ｓ∧ｂｓｔ´ｉｔ∫ｕ∂ｎｔ〕 (원자의)치환분, ~constant 치환기 상수
axial substituent : 1)축방향 치환체 2)수직방향 치환체
substituent : 치환기, 치환체
HS29081
할로겐화유도체와 이들의 염
Derivatives containing only halogen substituents and their salts :
substituents found on the hydrocarbon skeleton and a subscript (1, 2 or 3) to indicate
the number of double bonds in the hydrocarbon skeleton e.g., PGE2. The predominant
naturally occurring prostaglandins all have two double bonds and are synthesized from
arachidonic acid (5,8,11,14-eicosatetraenoic acid) by the pathway shown in the
illustration. The 1 series and 3 series are produced by the same pathway with fatty
acids having one fewer double bond (8,11,14-eicosatrienoic acid or one more double bond
(5,8,11,14,17-eicosapentaenoic acid) than arachidonic acid. The subscript a or ß indicates
the configuration at C-9 (a denotes a substituent below the plane of the ring, ß, above
the plane). The naturally occurring PGF's have the a configuration, e.g., PGF2a. All of
the prostaglandins act by binding to specific cell-surface receptors causing an increase
in the level of the intracellular second messenger cyclic AMP (and in some cases cyclic
GMP also). The effect produced by the cyclic AMP increase depends on the specific cell
type. In some cases there is also a positive feedback effect. Increased cyclic AMP
increases prostaglandin synthesis leading to further increases in cyclic AMP.
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