3,4-Dihydroquinazoline 1 as T-type calcium channel blocker was in vivo evaluated against A549 xenograft in BALB/c-nu Slc mice, which exhibited 54% tumor growth inhibition through oral administration of 8 mg/kg of body weight and was slightly less active than doxorubicin (68%). In addition, this compound was also profiled for its acute toxicity to ICR mice to afford oral LD50 value of 1,038 mg/kg of body weight.
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