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A vehicle key system comprises a transmitter including a fingerprint information capturing unit for capturing fingerprint information from a user's fingerprint, and a transmit unit for transmitting the fingerprint information captured by the fingerprint information capturing unit. The system also in

A vehicle key system comprises a transmitter including a fingerprint information capturing unit for capturing fingerprint information from a user's fingerprint, and a transmit unit for transmitting the fingerprint information captured by the fingerprint information capturing unit. The system also includes an attaching unit disposed in a vehicle, for attaching the transmitter thereto, and a receiver disposed in the vehicle, including a receive unit for receiving the fingerprint information transmitted from the transmit unit of the transmitter, a fingerprint verification unit for verifying the fingerprint information against a list of pieces of previously stored fingerprint information, an attaching detection unit for determining whether or not the transmitter is attached to the attaching unit, and a control unit for controlling pieces of equipment in the vehicle according to a verification result from the fingerprint verification unit and a detection result from the mounting detection unit. The user can manipulate the pieces of equipment, e.g. start the engine, by actuating a switch, only when the electronic key transmitter is attached to the attaching unit.

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A vehicle key system comprises a transmitter including a fingerprint information capturing unit for capturing fingerprint information from a user's fingerprint, and a transmit unit for transmitting the fingerprint information captured by the fingerprint information capturing unit. The system also in

A vehicle key system comprises a transmitter including a fingerprint information capturing unit for capturing fingerprint information from a user's fingerprint, and a transmit unit for transmitting the fingerprint information captured by the fingerprint information capturing unit. The system also includes an attaching unit disposed in a vehicle, for attaching the transmitter thereto, and a receiver disposed in the vehicle, including a receive unit for receiving the fingerprint information transmitted from the transmit unit of the transmitter, a fingerprint verification unit for verifying the fingerprint information against a list of pieces of previously stored fingerprint information, an attaching detection unit for determining whether or not the transmitter is attached to the attaching unit, and a control unit for controlling pieces of equipment in the vehicle according to a verification result from the fingerprint verification unit and a detection result from the mounting detection unit. The user can manipulate the pieces of equipment, e.g. start the engine, by actuating a switch, only when the electronic key transmitter is attached to the attaching unit. l are optionally substituted with a substituent selected from R4. 4. The compound of claim 1 wherein R1is selected from the group consisting of hydrogen, benzyl, phenylpropyl and benzofurylmethyl, wherein phenyl, the phenyl portion of benzyl and the benzofuryl portion of benzofurylmethyl are optionally substituted with a substituent selected from R4. 5. The compound of claim 1 wherein R2is hydrogen. 6. The compound of claim 1 wherein R3is aryl(C2-8)alkenyl, wherein aryl is optionally substituted with one to three substituents independently selected from halogen. 7. The compound of claim 1 wherein R3is a substituent independently selected from the group consisting of phenethenylene and phenylpropenylene, wherein phenyl is optionally substituted with one to three substituents independently selected from the group consisting of chlorine and fluorine. 8. The compound of claim 1 wherein R3is phenethenylene, wherein phenyl is substituted with one to three substituents selected from chlorine. 9. The compound of claim 1 wherein R4is selected from the group consisting of hydroxy, di(C1-4alkyl)amino, C1-8alkoxy, carboxy, carboxy(C1-8)alkoxy, aryl(C1-8)alkoxy, C1-8alkoxycarbonyl, C1-8alkoxycarbonyl(C1-8)alkoxy, aminocarbonyl, (C