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Chilobolide A,C_(22)H_(30)O_5,M.W.=374.5,orthorhombic,space group P 2_12_12_1,a=8.753(2),b=8.887 (3),c=54.247 (14) ,V=4220(2) ~3,Z=8,D_x=1.17g.cm~(-3),F(000)=1616eat room temperature.The structure was solved by direct methods with diffractometer data mea-sured with Cu Kα radiation,and block-full-matrix least-squares refinement converged at R=0.064for 1805 observed reflections.Both molecules in an asymmetric unit have similar conformation.The molecular skeleton is bicyclic system,in which an envelope form γ-lactone ring is cis-fused toa cyclotridecadiene ring,the latter ring is in [-+-+-++++-+--]asymmetric conforma-tion;the methyl groups attached to 4-C and 13-C are situated on E-type double bond,the acetylgroup is in equatorial orientation at 10-C and the acetoxy group is in axial at 9-C.
Chilobolide A C 22 H 30 O 5 MW = 374.5 orthorhombic space group P 2_12_12_1 a = 8.753 b = 8.887 3 c = 54.247 14 V = 4220 2 ) -3, Z = 8, Dx = 1.17g.cm -3, F (000) = 1616eat room temperature.The structure was solved by direct methods with diffractometer data mea- sured with Cu Kα radiation, and block- full-matrix least-squares refinement converged at R = 0.064 for 1805 observed reflections. Both molecules in an asymmetric unit have similar conformation. molecular molecular is bicyclic system, in which an envelope form γ-lactone ring is cis-fused toa cyclotridecadiene ring , the latter ring is in [- + - + - ++++ - + -] asymmetric conformation - the methyl groups attached to 4-C and 13-C are situated on E-type double bond, the acetylgroup is in equatorial orientation at 10-C and the acetoxy group is in axial at 9-C.