1270 in its HREIMS and the presence of 21 carbons on the [sup.
The positive HREIMS analysis showed an ion peak at m/z 436.
0, CHCl3) having molecular formula C29H50O3, based on HREIMS m/z 446.
The HREIMS showed the molecular mass to be m/z 576 which confirmed that 1 could be a cyclic trimer of dioxyethylene ester of benzene-1,4-dicarboxylic acid.
Nils Nyberg and Dorte Brix, Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, University of Copenhagen, for HREIMS and anti-plasmodial measurements.
15); The 1H and 13C-NMR data see Table- 2; HREIMS m/z: 224.
Its molecular formula C9H8O3 wasdeduced by HREIMS by a molecular ion peak [M] +at m/z 164.
Its chemical structure was determined by NMR and HREIMS spectra.
The HREIMS displayed molecular ion peak at m/z 342.
The 1H and 13C-NMR data, see Table-1; HREIMS m/z: 342.
EIMS and HREIMS spectra were recorded on Jeol JMS-HX 110 spectrometer with data system.
Its molecular formula C8H8O5 was determined by HREIMS through a peak at 184.