Semustine

Semustine
Systematic (IUPAC) name

N-(2-Chloroethyl)-N'-(4-methylcyclohexyl)-N-nitrosourea
Identifiers
CAS Number	13909-09-6^Y
ATC code	L01AD03 (WHO)
PubChem	CID 5198
ChemSpider	5009
UNII	6YY7T1T567^Y
KEGG	D05822^Y
ChEBI	CHEBI:6863^N
Chemical data
Formula	C₁₀H₁₈ClN₃O₂
Molar mass	247.72 g/mol
SMILES CC1CCC(CC1)NC(=O)N(CCCl)N=O
InChI InChI=1S/C10H18ClN3O2/c1-8-2-4-9(5-3-8)12-10(15)14(13-16)7-6-11/h8-9H,2-7H2,1H3,(H,12,15) Key:FVLVBPDQNARYJU-UHFFFAOYSA-N
^NY (what is this?) (verify)

Semustine is a drug used in chemotherapy.^[1] It is structurally similar to lomustine, being distinguished from it only by an additional methyl group. It has been taken off the drug market for investigation of its cancerous effects, rated as IARC Group 1 carcinogen or a known carcinogen.^[2]

References

↑ "Radiation therapy and fluorouracil with or without semustine for the treatment of patients with surgical adjuvant adenocarcinoma of the rectum. Gastrointestinal Tumor Study Group". Journal of clinical oncology : official journal of the American Society of Clinical Oncology 10 (4): 549–557. 1992. PMID 1548520.
↑ http://www.cancer.org/cancer/cancercauses/othercarcinogens/generalinformationaboutcarcinogens/known-and-probable-human-carcinogens, Known and Probable Human Carcinogens, American Cancer Society

Intracellular chemotherapeutic agents / antineoplastic agents (L01)

SPs/MIs
(M phase)

Block microtubule assembly	Vinca alkaloids (Vinblastine^# Vincristine^# Vinflunine^§ Vindesine Vinorelbine)

Block microtubule disassembly	Taxanes (Cabazitaxel Docetaxel^# Larotaxel Ortataxel^† Paclitaxel^# Tesetaxel) Epothilones (Ixabepilone)

DNA replication
inhibitor

DNA precursors/
antimetabolites
(S phase)

Folic acid	Dihydrofolate reductase inhibitor (Aminopterin Methotrexate^# Pemetrexed Pralatrexate) Thymidylate synthase inhibitor (Raltitrexed Pemetrexed)

Purine	Adenosine deaminase inhibitor (Pentostatin) Halogenated/ribonucleotide reductase inhibitors (Cladribine Clofarabine Fludarabine) Nelarabine Thiopurine (Thioguanine^# Mercaptopurine^#)

Pyrimidine	Thymidylate synthase inhibitor (Fluorouracil^# Capecitabine Tegafur (+gimeracil/oteracil) Carmofur Floxuridine) DNA polymerase inhibitor (Cytarabine^#) Ribonucleotide reductase inhibitor (Gemcitabine) Hypomethylating agent (Azacitidine Decitabine)

Deoxyribonucleotide	Ribonucleotide reductase inhibitor (Hydroxycarbamide)

Topoisomerase inhibitors
(S phase)

I	Camptotheca (Camptothecin Topotecan Irinotecan Rubitecan^‡ Belotecan)

II	Podophyllum (Etoposide^# Teniposide)

II+Intercalation	Anthracyclines (Aclarubicin Daunorubicin^# Doxorubicin^# Epirubicin Idarubicin Amrubicin^† Pirarubicin Valrubicin Zorubicin) Anthracenediones (Mitoxantrone Pixantrone)

Crosslinking of DNA
(CCNS)

Alkylating	Nitrogen mustards: Mechlorethamine Cyclophosphamide^# (Ifosfamide Trofosfamide) Chlorambucil^# (Melphalan Prednimustine) Bendamustine Uramustine Estramustine Nitrosoureas: Carmustine Lomustine (Semustine) Fotemustine Nimustine Ranimustine Streptozocin Alkyl sulfonates: Busulfan (Mannosulfan Treosulfan) Aziridines: Carboquone ThioTEPA Triaziquone Triethylenemelamine

Platinum-based	Carboplatin Cisplatin Nedaplatin Oxaliplatin Satraplatin

Nonclassical	Hydrazines (Procarbazine^#) Triazenes (Dacarbazine^# Temozolomide) Altretamine Mitobronitol Pipobroman

Intercalation	Streptomyces (Actinomycin^# Bleomycin^# Mitomycin Plicamycin)

Photosensitizers/PDT

Other

Enzyme inhibitors	FI (Tipifarnib^§) CDK inhibitors (Alvocidib^† Seliciclib^† Palbociclib) PrI Bortezomib Carfilzomib Ixazomib PhI (Anagrelide) IMPDI (Tiazofurin^§) LI (Masoprocol) PARP inhibitor (Olaparib) HDAC (Belinostat Panobinostat Romidepsin Vorinostat) PIKI (Idelalisib)

Receptor antagonists	ERA (Atrasentan) Retinoid X receptor (Bexarotene) Sex steroid (Testolactone)

Other/ungrouped	Amsacrine Trabectedin Retinoids (Alitretinoin Tretinoin) Arsenic trioxide Asparagine depleters (Asparaginase^#/Pegaspargase) Celecoxib Demecolcine Elesclomol^§ Elsamitrucin Etoglucid Lonidamine Lucanthone Mitoguazone Mitotane Oblimersen^† Omacetaxine mepesuccinate Eribulin

^#WHO-EM
^‡Withdrawn from market
Clinical trials:
- ^†Phase III
- ^§Never to phase III

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