Question

Name the following drug molecule:

• A. Mechlorethamine
• B. Chlorambucil
• C. Vincristine
• D. 6-Mercaptopurine

Hint:

- Mechlorethamine is an alkylating agent used in chemotherapy. - The presence of two chlorine atoms attached to nitrogen is a key feature of its structure. - Chlorambucil and 6-Mercaptopurine have different chemical structures and uses.

Answer 1

The Correct Option is A

The structure shown is that of Mechlorethamine, which is an alkylating agent commonly used in chemotherapy. It contains two chlorine atoms (Cl) attached to the nitrogen of an ethylene diamine group. This chemical structure is characteristic of Mechlorethamine, also known as Mustine, which is used in the treatment of various cancers, including lymphomas and leukemias. 

Why Other Options Are Incorrect: 
- (B) Chlorambucil: Although Chlorambucil is also an alkylating agent, its structure differs by having an aromatic ring and a different substitution pattern compared to Mechlorethamine. 
- (C) Vincristine: Vincristine is a vinca alkaloid used in chemotherapy but has a completely different structure, containing a complex ring system. 
- (D) 6-Mercaptopurine: 6-Mercaptopurine is a purine analog, not an alkylating agent, and its structure does not resemble the one shown. 

Thus, the correct drug name for the given structure is Mechlorethamine.

Answer 2

This question shows a drug structure and asks it to be identified as one of four well known anticancer agents. Each of the four drugs belongs to a different structural class, so matching the class the structure belongs to is the fastest way to the answer.

1. Mechlorethamine: This drug, also called nitrogen mustard, is built around a tertiary amine nitrogen carrying two 2-chloroethyl arms. Each chloroethyl group can cyclise into a reactive aziridinium ion that alkylates DNA, most often at the N7 position of guanine, which is how the drug kills rapidly dividing cancer cells. A structure showing a central nitrogen flanked by two chloroethyl chains is the signature of this bis-chloroethylamine alkylating agent class.
2. Chlorambucil: Chlorambucil is also a nitrogen mustard, but its nitrogen is attached to an aromatic benzene ring bearing a butanoic acid side chain, making it an aromatic nitrogen mustard. A structure without an attached benzene ring and carboxylic acid chain does not match chlorambucil.
3. Vincristine: Vincristine is a vinca alkaloid with a large, complex fused ring system derived from the Catharanthus plant. It looks nothing like a simple bis-chloroethylamine and works by binding tubulin rather than alkylating DNA directly.
4. 6-Mercaptopurine: This drug is a purine analogue, structurally a modified purine ring with a thiol group, used as an antimetabolite. It has no chloroethyl arms and works by mimicking natural purines during DNA synthesis, a completely different mechanism and structure from an alkylating mustard.

The bis-chloroethylamine arrangement centred on a simple aliphatic nitrogen, without an aromatic ring or complex fused system, is characteristic of mechlorethamine among these four options.

Therefore, the correct answer is Mechlorethamine.