Well, since a furlong seems to be 1/8 mile (http://www.nass.usda.gov/ok/bulletin00/page100.pdf)
which in meters equals 1609/8 = 201.25 m

* 1 Ångström is 0.1 nanometer

* 1 microfurlong is 0.000201125 meters or 201.125 micrometer

* 15 Ångström is 1.5 nanometer

This gives (if I got it right - and that's a pretty big if right now) that 15 Ångström
equals (roughly) 7.458E-6 microfurlong or 7.458 picofurlong

/Michael
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/Michael