Nitrophenyl pentadienal, nitrophenylpentadienal, NPPD, or METKA (Russian for \"mark\") colloquially known as \"spy dust\", is a chemical compound used as a tagging agent by the KGB during the Cold War Soviet Era. Soviet authorities in Moscow tracked Americans by applying an almost invisible powder to their clothing, cars, doorknobs and other objects. The spy dust glowed under ultraviolet light.

CAS：2608-48-2
中文别名：
英文别名：
分子式：C11H9NO3
分子量：203.194
精确质量：203.058
Psa：62.89
Logp：2.8863

蒸汽压：2.29E-05mmHg at 25°C

海关编码：2913000090