ACCESSION: MSBNK-UFZ-WANA409611C9CFPH
RECORD_TITLE: Dexamethasone-21-acetate; LC-ESI-ITFT; MS2; CE: 40%; R=15000; [M+H]+
DATE: 2023.08.12
AUTHORS: Tobias Schulze, Martin Krauss, Department of Effect-Directed Analysis, Helmholtz Centre for Environmental Research - UFZ, Leipzig, Germany
LICENSE: CC0
COPYRIGHT: Copyright (C) 2023
COMMENT: CONFIDENCE Reference Standard (Level 1)

CH$NAME: Dexamethasone-21-acetate
CH$NAME: Dexamethasone acetate
CH$NAME: [2-[(8S,9R,10S,11S,13S,14S,16R,17R)-9-fluoro-11,17-dihydroxy-10,13,16-trimethyl-3-oxo-6,7,8,11,12,14,15,16-octahydrocyclopenta[a]phenanthren-17-yl]-2-oxoethyl] acetate
CH$COMPOUND_CLASS: N/A; Environmental Standard
CH$FORMULA: C₂₄H₃₁FO₆
CH$EXACT_MASS: 434.210466932
CH$SMILES: C[C@@H]1C[C@H]2[C@@H]3CCC4=CC(=O)C=C[C@]4(C)[C@@]3(F)[C@@H](O)C[C@]2(C)[C@@]1(O)C(=O)COC(C)=O
CH$IUPAC: InChI=1S/C24H31FO6/c1-13-9-18-17-6-5-15-10-16(27)7-8-21(15,3)23(17,25)19(28)11-22(18,4)24(13,30)20(29)12-31-14(2)26/h7-8,10,13,17-19,28,30H,5-6,9,11-12H2,1-4H3/t13-,17+,18+,19+,21+,22+,23+,24+/m1/s1
CH$LINK: CAS 1177-87-3
CH$LINK: CHEBI 4463
CH$LINK: KEGG C08174
CH$LINK: PUBCHEM CID:236702
CH$LINK: INCHIKEY AKUJBENLRBOFTD-RPRRAYFGSA-N
CH$LINK: CHEMSPIDER 206624
CH$LINK: COMPTOX DTXSID8022901

AC$INSTRUMENT: LTQ Orbitrap XL Thermo Scientific
AC$INSTRUMENT_TYPE: LC-ESI-ITFT
AC$MASS_SPECTROMETRY: MS_TYPE MS2
AC$MASS_SPECTROMETRY: ION_MODE POSITIVE
AC$MASS_SPECTROMETRY: IONIZATION ESI
AC$MASS_SPECTROMETRY: FRAGMENTATION_MODE HCD
AC$MASS_SPECTROMETRY: COLLISION_ENERGY 40 % (nominal)
AC$MASS_SPECTROMETRY: RESOLUTION 15000
AC$MASS_SPECTROMETRY: MASS_RANGE_M/Z 50-450
AC$CHROMATOGRAPHY: COLUMN_NAME Kinetex Evo C18 2.6 um 50 x 2.1 mm
AC$CHROMATOGRAPHY: FLOW_GRADIENT 95/5 at 0 min, 95/5 at 1 min, 0/100 at 13 min, 0/100 at 24 min, 95/5 at 24.3 min, 95/5 at 32 min
AC$CHROMATOGRAPHY: FLOW_RATE 300 uL/min
AC$CHROMATOGRAPHY: RETENTION_TIME 10.685 min

MS$FOCUSED_ION: BASE_PEAK 271.1694
MS$FOCUSED_ION: PRECURSOR_M/Z 435.2177
MS$FOCUSED_ION: PRECURSOR_TYPE [M+H]+
MS$FOCUSED_ION: PRECURSOR_INTENSITY 4232385
MS$DATA_PROCESSING: RECALIBRATE loess on assigned fragments and MS1
MS$DATA_PROCESSING: REANALYZE Peaks with additional N2/O included
MS$DATA_PROCESSING: WHOLE RMassBank 3.11.2

PK$SPLASH: splash10-00ba-0790000000-d5974867b0f741cf8db4
PK$ANNOTATION: m/z tentative_formula formula_count mass error(ppm)
  121.0648 C8H9O+ 1 121.0648 0.37
  147.081 C10H11O+ 2 147.0804 3.86
  225.1265 C16H17O+ 1 225.1274 -4.14
  263.1427 C19H19O+ 1 263.143 -1.43
PK$NUM_PEAK: 4
PK$PEAK: m/z int. rel.int.
  121.0648 1350.7 523
  147.081 1713.4 663
  225.1265 2580 999
  263.1427 1253.5 485
//