There are provided compounds of the formulawherein X, Y, R1, R2, R3, R3, R4, R5, R6 and R7 are as described hereinand enantiomers and pharmaceutically acceptable salts and esters thereof. After transporting the product to its destination, a hydrocarbon processing train and liquid displacement method is provided to unload the liquid from the pipeline and storage system, separate the liquid carrier, and transfer the gas stream to a storage or transmission system. The connecting portion has a smaller width than that of the first end portion so that the peeling force acting on the first end portion is alleviated. The device further comprises a storage device configured to store the energy. The delay circuit is adapted for receiving and delaying the starting signal for a predetermined period and then outputting the delayed starting signal.