10.22376/ijpbs.2019.10.1.p1-12 Volume 11 Issue 4 2020 (October-December) lessThan i greaterThan Pithecellobiumdulce lessThan /i greaterThan  is a species of the family fabaceae. The methanolic extract of leaves was obtained by a Soxhlet extractor followed by concentration in rotary evaporator. Separation of bioactive chemicals was carried out by column chromatography and thin layer chromatoghraphy while studies by GC-MS which shows presence of six major fractions were collected by eluting the column with ethyl acetate: formic acid: acetic acid: water at 100:11:11:26 proportions. Major fractions arePhytol, Dibutylphthalate, Anthracene, 9(3butenyl), 1,3Docosenamide, 3, 6, 9Triethyl,3 6, 9trimethyl Formic acid. The major component was subjected to further purificationby using preparative thin layer chromatography. The bioactive component recovered from TLCanalyses by GC-MS &NMR. The lessThan sup greaterThan 1 lessThan /sup greaterThan H-NMR spectrum shows the peak at δ 4.08- 4.13 corresponds to the protons of the cyclic ring of aromatic hydrogen appear as multiplet. The CH lessThan sub greaterThan 2 lessThan /sub greaterThan -O nearer to phthalate group gives signal near δ 2.11-2.16 ppm is appeared as doublet, then butyl groupaliphaticCH lessThan sub greaterThan 2 lessThan /sub greaterThan gives signal nearδ 1.91-1.96 is appeared as doublet also but δ 1.31-1.28 value showing CH lessThan sub greaterThan 3 lessThan /sub greaterThan of the di-butyl group. On the basis of above spectral data of GC-MS, lessThan sup greaterThan 1 lessThan /sup greaterThan HNMR& FT- IR assign structure of isolate lessThan i greaterThan Pithecellobiumdulce lessThan /i greaterThan  leaves. A. F.Bobade* GC-MS, Soxhlet, Rotary evaporator, Column Chromatography, TLC, NMR, Dibutyl phthalate 61-67