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Acta Cryst. (2004). E60, o1622-o1623  [ doi:10.1107/S1600536804020240 ]

20-Oxopregna-5,16-dien-3[beta]-yl acetate

G.-P. Tang, X.-R. Hu and J.-M. Gu

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checkCIF/PLATON results

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Alert level C REFNR01_ALERT_3_C Ratio of reflections to parameters is < 8 for a non-centrosymmetric structure, where ZMAX < 18 sine(theta)/lambda 0.6491 Proportion of unique data used 0.6001 Ratio reflections to parameters 6.8723 PLAT089_ALERT_3_C Poor Data / Parameter Ratio (Zmax .LT. 18) ..... 6.87 PLAT152_ALERT_1_C Supplied and Calc Volume s.u. Inconsistent ..... ? PLAT220_ALERT_2_C Large Non-Solvent C Ueq(max)/Ueq(min) ... 2.57 Ratio PLAT242_ALERT_2_C Check Low U(eq) as Compared to Neighbors for C2 PLAT242_ALERT_2_C Check Low U(eq) as Compared to Neighbors for C20
Alert level G REFLT03_ALERT_4_G Please check that the estimate of the number of Friedel pairs is correct. If it is not, please give the correct count in the _publ_section_exptl_refinement section of the submitted CIF. From the CIF: _diffrn_reflns_theta_max 27.47 From the CIF: _reflns_number_total 2691 Count of symmetry unique reflns 2690 Completeness (_total/calc) 100.04% TEST3: Check Friedels for noncentro structure Estimate of Friedel pairs measured 1 Fraction of Friedel pairs measured 0.000 Are heavy atom types Z>Si present no
0 ALERT level A = In general: serious problem 0 ALERT level B = Potentially serious problem 6 ALERT level C = Check and explain 1 ALERT level G = General alerts; check 1 ALERT type 1 CIF construction/syntax error, inconsistent or missing data 3 ALERT type 2 Indicator that the structure model may be wrong or deficient 2 ALERT type 3 Indicator that the structure quality may be low 1 ALERT type 4 Improvement, methodology, query or suggestion

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