Nolatrexed dihydrochloride (Thymitaq) is the dihydrochloride salt of nolatrexed, a water-soluble lipophilic quinazoline folate analog with antineoplastic activity. Nolatrexed occupies the folate binding site of thymidylate synthase, resulting in inhibition of thymidylate synthase activity and thymine nucleotide synthesis with subsequent inhibition of DNA replication, DNA damage, S-phase cell cycle arrest, and caspase-dependent apoptosis. This agent also exhibits radiosensitizing activity.

Risdiplam (RO7034067) (RG7916) is orally administered. Risdiplam is a centrally and peripherally distributed SMN2 pre-mRNA splicing modifier which increases survival motor neuron (SMN) protein levels[1].

SCR7, a specific DNA Ligase IV inhibitor, blocks nonhomologous end-joining (NHEJ).

Procarbazine hydrochloride (NSC-77213 HCl) is the hydrochloride salt of a methylhydrazine derivative with antineoplastic and mutagenic activities. Although the exact mode of cytotoxicity has not been elucidated, procarbazine, after metabolic activation, appears to inhibit the trans-methylation of methionine into transfer RNA (t-RNA), thereby preventing protein synthesis and consequently DNA and RNA synthesis. This agent may also undergo auto-oxidation, resulting in the formation of cytotoxic free radicals which damage DNA through an alkylation reaction.

2-Aminopurine is a double-stranded RNA-dependent protein kinase, protein kinase R (PKR) inhibitor.